I am sending 10 values to a server using Retrofit2. The values I am sending should be (according to the logd):  

*getRecommendations* values: 

`-1, -1, -1, -1, -1, -1, 3, 25, 44.182345, 7.1627383.`

However when I send the values to the server (to a PHP script) with retrofit they are being sent as  

`-1, -1 ,0 ,-1 ,-1 ,0 ,25 ,44.182345 , 7.1627383`.  

I know this because I'm using a PHP interceptor in Android Studio. Here is what the PHP interceptor shows:
*`maxGradientLo=-1&maxGradientHi=-1&totalDistanceLo=0&totalDistanceHi=-1&altitudeGainLo=-1&altitudeGainHi=-1&numberToRecommend=0&searchWithin=25&currentLatitude=44.182345&currentLongitude=7.1627349853515625`*   

I'm confused as to why this is the case - some of the values have just randomly changed, below I have attached parts of my code.  

getRecommendations() - sends data to server
===========================================

```
private List<RecommendationJsonResponse> jsonResponse = null;

private void getRecommendations(int maxGradientLo, int maxGradientHi, int totalDistanceLo, int totalDistanceHi, int altitudeGainLo, int altitudeGainHi, int numberToRecommend, int searchWithin, double currentLatitude, double currentLongitude){

        Log.d(Constants.SkiCompanionDebug, "getRecommendations values: " + maxGradientLo + ", "+ maxGradientHi + ", "+ totalDistanceLo + ", "+ totalDistanceHi + ", "+ altitudeGainLo + ", "+ altitudeGainHi + ", "+ numberToRecommend + ", "+ searchWithin);

        RetrofitApiInterface retrofitApiInterface = RetrofitApiClient.getApiClient().create(RetrofitApiInterface.class);

        Call<List<RecommendationJsonResponse>> callRecommendations = retrofitApiInterface.downloadRecommendations(maxGradientLo,  maxGradientHi, totalDistanceLo, totalDistanceHi, altitudeGainLo, altitudeGainHi, numberToRecommend, searchWithin, currentLatitude, currentLongitude);
        callRecommendations.enqueue(new Callback<List<RecommendationJsonResponse>>() {
            @Override
            public void onResponse(Call<List<RecommendationJsonResponse>> call, Response<List<RecommendationJsonResponse>> response) {
                jsonResponse = response.body();

                //calling helper functions to populate map with ski tracks
                List<List<GeoPoint>> trackList = new ArrayList<>();

                trackList = populateGeoPointLists();
                populateMap(trackList);

            }

            @Override
            public void onFailure(Call<List<RecommendationJsonResponse>> call, Throwable t) {
                Log.d(Constants.SkiCompanionDebug, "onFailure: downloadRecommendations: " + t.getMessage());
            }
        });
    }

```

Definition of the method in the Retrofit interface
==================================================

```
@POST("download_recommendations.php")
    @FormUrlEncoded
    Call<List<RecommendationJsonResponse>> downloadRecommendations(@Field("maxGradientLo") int maxGradientLo,
                                         @Field("maxGradientHi") int maxGradientHi,
                                         @Field("totalDistanceLo") int totalDistanceLo,
                                         @Field("totalDistanceHi") int totalDistanceHi,
                                         @Field("altitudeGainLo") int altitudeGainLo,
                                         @Field("altitudeGainHi") int altitudeGainHi,
                                         @Field("numberToRecommend") int numberToRecommend,
                                         @Field("searchWithin") int searchWithin,
                                         @Field("currentLatitude") double currentLatitude,
                                         @Field("currentLongitude") double currentLongitude);

```

calling getRecommendations()
============================

```
final int[] gradient = new int[2];
final int[] distance = new int[2];
final int[] altitude = new int[2];
final int[] recommendNumber = new int[1];
final int[] searchWithin = new int[1];

//initializing variables
gradient[0] = -1;
gradient[1] = -1;
distance[0] = -1;
distance[1] = -1;
altitude[0] = -1;
altitude[1] = -1;
recommendNumber[0] = 3;
searchWithin[0] = 25;

getRecommendations(gradient[0], gradient[1], distance[0], distance[1], altitude[0], altitude[1], recommendNumber[0], searchWithin[0], 44.182345, 7.1627383);

```

PHP script where values are posted - note when I echo, the values are wrong, with the same values as the PHP interceptor gave
=============================================================================================================================

```
$maxGradientLo = $_POST["maxGradientLo"]; //degrees
$maxGradientHi = $_POST["maxGradientHi"];
$totalDistanceLo = $_POST["totalDistanceLo"]; //kilometers
$totalDistanceHi = $_POST["totalDistanceHi"];
$altitudeGainLo = $_POST["altitudeGainLo"]; //meters
$altitudeGainHi = $_POST["altitudeGainHi"];
$numberToRecommend = $_POST["numberToRecommend"];
$searchWithin = $_POST["searchWithin"]; //number of kilometers track can be from user
$currentLatitude = $_POST["currentLatitude"]; 
$currentLongitude = $_POST["currentLongitude"];

// echo "gradLo: " .$maxGradientLo ." gradHi: " .$maxGradientHi." distLo: " .$totalDistanceLo." distHi: " .$totalDistanceHi." altLo: " .$altitudeGainLo." altHi: " .$altitudeGainHi. " numTorecommend: ".$numberToRecommend;

```

Extract from OkHttp interceptor
===============================

```
02-22 17:12:31.967 25165-25426/skicompanion.skicompanion D/OkHttp: --> POST http://192.168.1.11/ski_companion/download_recommendations.php
02-22 17:12:31.967 25165-25426/skicompanion.skicompanion D/OkHttp: Content-Type: application/x-www-form-urlencoded
02-22 17:12:31.970 25165-25426/skicompanion.skicompanion D/OkHttp: Content-Length: 204
02-22 17:12:31.971 25165-25426/skicompanion.skicompanion D/OkHttp: maxGradientLo=-1&maxGradientHi=-1&totalDistanceLo=0&totalDistanceHi=-1&altitudeGainLo=-1&altitudeGainHi=-1&numberToRecommend=0&searchWithin=25&currentLatitude=44.182345&currentLongitude=7.1627349853515625
02-22 17:12:31.972 25165-25426/skicompanion.skicompanion D/OkHttp: --> END POST (204-byte body)
02-22 17:12:32.212 25165-25426/skicompanion.skicompanion D/OkHttp: <-- 200 OK http://192.168.1.11/ski_companion/download_recommendations.php (239ms)
02-22 17:12:32.212 25165-25426/skicompanion.skicompanion D/OkHttp: Date: Thu, 22 Feb 2018 17:12:33 GMT
02-22 17:12:32.212 25165-25426/skicompanion.skicompanion D/OkHttp: Server: Apache/2.4.29 (Win32) OpenSSL/1.1.0g PHP/7.2.1
02-22 17:12:32.213 25165-25426/skicompanion.skicompanion D/OkHttp: X-Powered-By: PHP/7.2.1
02-22 17:12:32.213 25165-25426/skicompanion.skicompanion D/OkHttp: Keep-Alive: timeout=5, max=100
02-22 17:12:32.213 25165-25426/skicompanion.skicompanion D/OkHttp: Connection: Keep-Alive
02-22 17:12:32.213 25165-25426/skicompanion.skicompanion D/OkHttp: Transfer-Encoding: chunked
02-22 17:12:32.213 25165-25426/skicompanion.skicompanion D/OkHttp: Content-Type: text/html; charset=UTF-8
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02-22 17:12:32.406 25165-25426/skicompanion.skicompanion D/OkHttp: <-- END HTTP (17280-byte body)

```

extra POJO classes
==================

```
public class RetrofitApiClient {

    public static final String BASE_URL = "http://" + Constants.SERVER_IP + "/ski_companion/";
    public static Retrofit retrofit = null;

    public static Retrofit getApiClient(){
        if(retrofit == null){
            HttpLoggingInterceptor interceptor = new HttpLoggingInterceptor();
            interceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
            OkHttpClient client = new OkHttpClient.Builder()
                    .addInterceptor(interceptor)
                    .retryOnConnectionFailure(true)
                    .connectTimeout(15, TimeUnit.SECONDS)
                    .build();

            retrofit = new Retrofit.Builder().baseUrl(BASE_URL).
                    addConverterFactory(GsonConverterFactory.create()).client(client).build();
        }

        return retrofit;
    }
}

```