Hey there, Thebasketballs,
Thanks for visiting the Apple Support Communities. It sounds like you need some help a specific app on your iPhone that does not work as expected. You can get guidance on how to address that here: If an app on your iPhone or iPad stops responding, closes unexpectedly, or won’t open - Apple Support.
One of the steps included in that resource does request you delete then reinstall the app. Depending on how the app itself manages your data, it may or may not be recovered simply by signing back into your account once reinstalled. It may also save with iCloud, or an iPhone backup. We encourage you to check with the app developer directly for more information on how your app data is managed: How to contact an app developer - Apple Support
Have a great day!