There are a few reasons why your apps might be disappearing from your iPad. Here are a few possible explanations
You accidentally deleted them. If you accidentally swiped an app to delete it, you can restore it from the App Store.
Your iPad is low on storage space. If your iPad is running out of storage space, it may delete apps to free up space. You can free up space by deleting unused apps, photos, and videos, or by upgrading your iPad’s storage capacity.
Your iPad is jailbroken. If your iPad is jailbroken, you may have installed a tweak that is causing your apps to disappear. You can try uninstalling the tweak or restoring your iPad to factory settings.
There is a problem with your iPad’s software. If your iPad is up to date on the latest software, you can try resetting your iPad or restoring it to factory settings.