Seems to be about once a week or so, all (4) of my spreadsheet formulas are replaced with incorrect cell references. I’m guessing that Excel then replaces the formula for those entire columns.
So I’ll go to my spreadsheet, correct the formulas, then regenerate the structure in AppSheet.
AppSheet is designed to work as best as it can with spreadsheet formulas. It isn’t its primary purpose and there are some formulas that just don’t make sense for use with AppSheet. Below are a couple articles that may help.
Having said that, I agree with @Steve. If you are building new data and a new app, I would advise to avoid using sheet formulas. They are not needed, There are circumstances, however, when a sheet has existed for some time and is in heavy use that the inclusion of formulas can’t be avoided.
Since I no longer use formulas, I don’t have the experience to help with your specific issue. Hopefully, other Excel users (and there are other AppSheet users with Excel sheets that have formulas) will be able to chime in!