"View cell history" for certain cells in a collection of rows shows a user updating those cells at 8:43am.
In Activity Monitor, I see that user's action at 8:43am was "Row hierarchy changes." So, she didn't actually update the cell contents, which is just a formula displaying red, green or yellow status if certain dates are X days in the future, etc.
Is the history just saying that she was the first person to collapse or expand a row that contained a time-based change?