You've got me here to share some tips on how you can fix unusual behavior while utilizing QuickBooks Online.
Generally, when you encounter performance issues upon using QuickBooks Online, it's recommended to access your account on a private window. This is to test if the problem has something to do with your browser.
If doing this works fine, you can go back to your regular browser and clear its cache. Web-based platforms like QBO collects cache files for faster browsing, but these data can be corrupted and often cause unexpected hurdle in the program. Eliminating them is the best way to refresh your file.
To give you more troubleshooting steps on what to do if QBO is running slow, and on what is the browser that works best for the program, please see these resources: