Quotation marks in formula giving wrong output

Hi,

I have a workbook which is a basic form which was created by someone else. If I enter the formula:

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I would expect to get a blank cell if the statement is true, but instead I get the word Genius output in the cell.

With further testing I have found that any formula which results in quotation marks, or text between quotation marks, outputs Genius instead. There is no code in the workbook, and I cannot see any options which would cause this.

My Google / search skills have truly failed me in this case - any help would be greatly appreciated.