Excel workbooks keep breaking

Hi All,

Sorry if this is not the right place to ask, I'm new here.

Since a couple of days, my Excel workbooks keep breaking. When opening specific files, Excel states the file needs to be repaired. Everytime certain formulas are being deleted and the values are just pasted as is. I haven't had any issues with these files in the past. 

Previously I used a license which I bought online via a third party. It seems the issues started after an update. I switched to a license which I bought directly from Microsoft. I did a clean installation, removed all the previous versions files but the issue still exists. For a couple of days I can open the files without problems. And then yesterday excel showed an update was available and excel had to be reopened. After doing so, the issues came up again. 

I have a Office Home 2024 License, Excel version 16.106.1, on macOS Tahoe 26.2.

T.I.A