I trained the MobilenetV3 model with the input of range [-1,1] by passing the argument
include_preprocessing = True
Then, while the model is predicting with the
var output = await Tflite.runModelOnImage(
      path: image.path,
      numResults: 14,
      imageMean: 127.5,
      imageStd: 127.5,
);

function on TFLite, it always predicts the same class.
Colab Link of the model 3