Hi saboomer,
Thanks for reaching out and posting in Apple Support Communities. We'll be happy to help get you pointed in the right direction so you can get this issue reported.
Since the app isn't developed by Apple, you will want to contact the app developer to let them know what's happening when using their app. The steps are below along with the link if you should need it.
How to contact an app developer - Apple Support
When to contact an app developer for help
If an app isn't working, but the issue doesn't affect other apps
If you can't use an in-app purchase, such as a bonus game level or "remove ads"
Contact the developer of an iOS, iPadOS, or watchOS app
1: Open the App Store on your iPhone or iPad.
2: Search for the app, then tap it. If you can't find it, tap the account button
or your photo at the top of the screen, tap Purchased, tap "Not on this [device]," then tap the app.
3: The app's product page appears. Scroll to the Ratings & Reviews section, then tap App Support. If you don't see App Support, make sure that you're signed in with the correct Apple ID.
Take care!