Greetings gustavo,
Thank you for using Apple Support Communities.
This article can help explain how app refresh works with apps: Switch apps on your iPhone, iPad, or iPod touch - Apple Support
"Use Background App Refresh
After you switch to a different app, some apps run for a short period of time before they're set to a suspended state. Apps that are in a suspended state aren’t actively in use, open, or taking up system resources. With Background App Refresh, suspended apps can check for updates and new content.
If you want suspended apps to check for new content, go to Settings > General > Background App Refresh and turn on Background App Refresh. If you quit an app from the app switcher, it might not be able to run or check for new content before you open it again."
Additionally, if an app isn't working as expected, you can these steps to see if it helps: If an app on your iPhone or iPad stops responding, closes unexpectedly, or won’t open - Apple Support
If this doesn't help, contact the app developer: How to contact an app developer - Apple Support
Cheers.