Pivot Table With Columns not in sheet data

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My boss sent me a workbook with a pivot table. This pivot table has two columns that are not on the worksheet the pivot table is built from and have formulas in them. I think they are part of the pivot table and not some kind of inserted columns because they are in the middle of other columns and when you select the drop down to add or subtract columns they appear in the drop down list. My problem is when I change the source data and refresh the pivot table the two columns move to the front of the columns and then the formulas don't work. Please help