Problem with save as new and column formula



I have a spreadsheet that has some column formulas in it. I did a "save as new" and deleted some columns that had formulas in them in the copy of the original spreadsheet. For a reason that I don't understand, the formulas in the original sheet stopped working. I don't see how modifying the copy changed the original.

Does someone have an idea of what could have happened?

Thank you for the help!


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