We have an existing spreadsheet that has been working fine. Today we double-clicked a cell, to edit the formula, but did not change anything (we tested on other cells to check). When hitting enter, or clicking another cell after getting the cell in edit-mode, the cell stopped showing the formula result and instead showed the formula.
e.g cell was showing "102". Double-click and it showed =100+2. Hit enter and it shows "=100+2".
We haven't changed workbook settings, so why would it start doing this and how can we fix it?