Apple Calendar is automatically deleting new event details

Whenever I create a new event on the apple calendar app on my Mac, it immediately deletes all the event details that I put in such as name, location, etc. I have to put in this information multiple times before it saves it, and as a result sometimes it will delete events without me noticing, leaving me with a "new event" blocked out but no clue what that event is. This is very frustrating.

It's not an issue with any syncing features - even when I turn off syncing completely this happens. I've also tried restarting the program, restarting my computer, and looking for updates (there weren't any that I could find). Anyone know what is causing this and how I can fix it?