Hi,

I have an issue happening with one spreadsheet that is losing cell border formatting by itself. This spreadsheet is shared between some users, but they're not removing the formatting on the sheet, according to file history. For example, this morning the file had unfomatted cell borders (image attached to the post), and then like 5 hours after fixing the cell borders, they unformatted again.

Sometimes I try closing the file and the opening again when formatting issues appear on the sheet, but this time the cell borders stay unformatted. Is this common to happen on heavily-edited spreadsheets, or something happening recently that is causing that kind of issue?