Do you have the latest version of Gospel Library installed (currently 7.3.1)? There was a bug fix in 7.3.0 that sounds similar to what you're seeing: "Fixed an issue where the app didn’t always remember its location when opening or switching screens."
How do you usually open the app – do you tap the Gospel Library icon on your iOS Home screen, or do you use a widget? (There's a Come, Follow Me widget – if you use that to open the app, it will always open to the current Come, Follow Me lesson.)
Samuel Bradshaw • If you desire to serve God, you are called to the work.