When you see a "cell is out of date" error, it's typically a display issue that can be resolved with a hard refresh of your browser:
** Windows: Press Ctrl + Shift + R
** Mac: Press Cmd + Shift + R
This refreshes your cache and should resolve the error. Alternatively, you can try toggling the auto-update feature off and on again by clicking the Auto-update icon at the bottom right of your table.