they have said - I support my own server and iOS users don't have this issue as they are native with CalDAV, however the use of your app have shown issues. It had also deleted calendar entries but unfortunately those logs are not available to me. Please assist, I paid for this app hoping it would work fine.
I can't reproduce the problem. I'm using DAVx⁵ + Nextcloud 15 every day and I dont have these problems, nor are there other reports about such problems at the moment.
Please provide exact steps to reproduce so that I can have a look. Without being able to reproduce a problem, I can't say anything about it. Also, please provide Web server and CalDAV/CardDAV server logs taken while the problem occurs, DAVx⁵ debug info (DAVx⁵ / Settings / Debug info) and verbose DAVx⁵ logs etc as described in [READ BEFORE POSTING] What's required to diagnose a problem.
@briangal Maybe your calendar storage on Android is corrupt. Try to reset/wipe it (Android settings / Apps / System apps / Calendar storage → Wipe data and cache). Be aware that all local calendars will then be deleted, also ones not synced by DAVx⁵. Most of these issues like wrong displays are based in the Android system itself.
If it still persists, you could also try to log the process in DAVx5 from within the DAVx⁵ app settings. Create the account, sync the calendar once. Start the extended logging, wait until the entries are duplicated and stop the logs. Then post them here and we could take a look at it.
Highly appreciate the troubleshooting efforts, regards.