There's a known issue in iOS Gospel Library where this can happen after updating to Gospel Library 5.3.0. The developers don't know what causes it yet. The workaround is to delete and reinstall the app. (Before deleting the app, make sure your recent highlights/notes, if you use the annotation tools, are safely synced to Notes.ChurchofJesusChrist.org. They will sync back down to your device after you reinstall and sign in.)
Samuel Bradshaw • If you desire to serve God, you are called to the work.