Hi @mispisi
This looks as though someone has changed the schema of a layer or layers whilst this project has been taken offline, or overwritten the service that has been taken offline.
Please see the following documentation which should assist in retrieving the offline edits
Access offline edits from ArcGIS Field Maps directly from an iOS or Android device
Hi @DanielFox1
Thank you for your response. We had disabled the offline option for our field maps so I don't think that is the issue. I might look into the schema change a bit further though. I'm very curious about why this happened.