Hi agape099,
You'll want to make sure that the app with this issue is fully updated. The steps below show how, if needed:
"How to manually update apps on your iPhone or iPadOpen the App Store.Tap your profile icon at the top of the screen.Scroll to see pending updates and release notes. Tap Update next to an app to update only that app, or tap Update All.
Learn what to do if you can't update an app on your iPhone or iPad."
Those steps are from this article: How to manually update apps on your Apple device - Apple Support
To help us understand this better, can you tell us if this is only happening in PUBG New State or does it appear to be multiple apps? Does this happen when using the app on Wi-Fi, mobile data, or both? Your answers can determine possible next steps.
Take care.