Hello Jesain,
Thank you for reaching out to Apple Support Communities.
These steps can help with 3rd party apps:
"If an app on your iPhone or iPad doesn't work as expected, try this.
1.Close and reopen the app
Force the app to close. Then open the app to see if it works as expected.
2.Restart your device
Restart your iPhone or restart your iPad. Then open the app to see if it works as expected.
3.Check for updates
To see if updates are available for the app, open the App Store, tap your profile icon, then scroll down to see if updates are available. If updates aren't available for the app, update the software on your iPhone or iPad.
4.Delete the app, then redownload it
Delete the app. When you do this, you might lose data that was stored in the app. Then redownload the app. Then check to see if the problem with the app is fixed."
More details can be found here: If an app on your iPhone or iPad stops responding, closes unexpectedly, or won’t open
If the issue persists, you may need to reach out to the developer.
You can do so by going to :How to contact an app developer
Hopefully this helps.
Cheers!