Hi @Akanichi, let's jump right into this!
In regards to the syncing of the data on the app: is this a fresh, new installation or not?
You mentioned that you disabled syncing, but this didn't work. How did you do this on your end? Have you tried these precise steps, in order to pause the app temporarily, until you can find a stable, WiFi connection, that you can use to sync data?
I hope this helps!