Differences between GC Web and GC app

I have been using the GC app (ios) for a long time. Now I wanted to edit training plans via the website and synchronize them with my watch. I noticed that a lot of data is not the same between the website and the app. Can anyone explain why this might be or what the solution to the problem is? After synchronizing with the website, my app no longer wants to load all the data via BT.