The issue is with this show (others may be affected, didn’t check):
How to reproduce the issue:
1- Open SeriesGuide with app data.
2- Add show Columbo. You can check how many episodes are and how they are distributed on each season
3- Restore adb backup, then from app select Restore Auto Backup on top.
4- Check again Columbo show. More episodes are added and others are are moved from one season to another or to Special Episodes.
5- Also episodes ticked as watched don’t match with the ones I have really watched and that I properly selected on previous version.
Now I have to clean start and check again one by one which episodes I’ve watched, and tick them again without restoring a backup.
On second post will add screenshots and backup files.