iOS endless sync loop: reinstall?

Hello Braintrust,
Scratching my head over a new development. One of my iPads seems to be stuck in an iCloud sync loop of some kind. If you go into the sync setting, normally MarginNote 4 tells you that it’s uploading or downloading and then stops with a “Database synced” message. On one of my iPads (11" iPad Pro), MarginNote seems stuck in a loop in which it cycles through “Uploading Notes to iCloud: Sample review group”, “Syncing database”, and “Uploading Notes to iCloud: Sample StudySet”. It never stops regardless of how long I let it go, and if I open MarginNote 4 on my Mac or other iPads they commence responding to it, as well - and will cycle the same way. If MarginNote is not open on the 11" iPad Pro the other devices sync and stop normally.

I assume this is some kind of corruption within the Sample Studyset that was installed with the application - I’ve never bothered to delete it, and occasionally check it to see if it highlights any new tricks that I should try with my own work. I will delete it, but before doing so thought I would reach out to see whether there are any other possible contributing factors that I should be aware of?

Thanks for any ideas! This is a great resource.

Dear Flann:

Thank you for your attention. So sorry for the inconvenience caused. We will submit this issue and work to solve it as soon as possible. Thanks again!

Best regards,
MN Support Team.

Dear Flann:

Sorry for the problem, please kindly try restarting your iPad.

Best regards,
MN Support Team.

Thanks. The problem did not resolve with restarting (tried this several times).
I deleted the Sample StudySet and am no longer seeing the issue - if it recurs with other documents/studysets I will reach out!