Also iNaturalist Android Logs (version 1.23.1 - 490 here.
https://forum.inaturalist.org/t/android-app-fails-to-syn-an-observation/24269 Maybe the same problem, but it is only one observation that duplicates in the app (?) and fails to sync with the website.
Those 440 observations, are the related to a real life situation or does the app have a mind of his own?
I do not autosync, I use the upload button but it does not work. I found out I can select observations and upload them one by one.