1. You have not had any real orders yet.
2. Browsers try to do their part to speed up the loading process. The first time you visit a site, the browser will save pieces of the site, because the browser can display the files stored in its cache much faster than it can pull fresh files from a server. The next time you visit that site, the cached files will help cut down the page load time by showing you the old version of the site (without Sales Pop app).
Using incognito window would help avoid remaining caches. This could be familiar to many internet users, but in case you're new to this option, don't worry, we'll get you covered.