I remember this problem with old Excel, even on Windows.
The problem is that Excel considers these columns to be part of a workbook. I'm sure there is a way to choose exactly what you need and tell Excel about the boundaries, but I don’t remember.
If you go into page mode, you will see what Excel considers your data. I think you can fix it here.
A simple solution is to select the column to the right of your data, expand the selection to the right, and delete the columns.
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