I’ve got these odd user-defined formats that I wanna get rid of, but when I try deleting them, next time I open the format cells window, they re-appear. Any way to get rid of them? They’re unused in the whole spreadsheet.

After doing some testing, whenever I copy a text from another document with these formats, even if the text itself is just pasted with “values only” or something like that, the formats are automatically and irreversibly added to the document. I fear that these are corrupted formats that are causing the old document to bug/crash the editor, which is why I wanna get rid of them.
