Hi Shae87,
Thanks for using Apple Support Communities. It sounds like you’re having trouble with your app folders on your iPhone. We’re happy to help.
First, check to make sure you’re running the latest iOS version:
Update your iPhone, iPad, or iPod touch - Apple Support
If that doesn’t help, try reinstalling iOS. While this shouldn’t remove any data from your iPhone, it’s a good idea to have a recent backup handy:
How to back up your iPhone, iPad, and iPod touch - Apple Support
To reinstall iOS, follow the steps below under the section labeled “Put your device in recovery mode and set it up again”:
If you can't update or restore your iPhone, iPad, or iPod touch - Apple Support
Let us know if that helps.
Take care.