Inserting cells in one sheet also impacts other cells in the file

Hello sub,

Sorry to bother but I have a bit of a headscratcher... One of my colleagues is working on an excel file that has a lot of information but very few complex formulas, no macros to speak of.

Yesterday, she was inserting cells in "sheet 1" and cells were inserted in "sheet 2" in the same column.

We went through the options menu and we didn't see anything suspect or obvious (other than recalculation turned off for some reason)

This is really slowing down her workflow and I wish I could help her.

Thank you in advance,

RNP.