It seems the calculators , on Rural info , aren't protected. To protect a calculator: Open calc., Click Review Tab ( Top right), Click Protect sheet ( or workbook, if long), a Pop up will appear- make sure "select unlock cells" has a tick next to it, enter a password of your choosing, click OK, another popup will ask you to reenter password- do it, click ok. Now you will only be able to enter data. No fear of changing formulas/formats.