Hey, @Katiewithnoclue. Welcome to the Photoshop Community. I'll need more specific info about this, and I'll help you figure this out. Before troubleshooting, update Photoshop to the latest version (v25.5.1) via the Creative Cloud desktop app & check if the issue exists.
If it does, please share the system info from Photoshop Help > System info > Copy & paste into a text document > upload & attach here.
Does this happen with all documents or a particular document?
Awaiting to hear from you. Thanks!