We have set up a mirror column from another board. However, it does not allow us to sort it both ascending and descending order. We have tried mirroring both the stage and status with numbers in it, but it still does not honor being sorted. We are able to sorting it correcting either ascending or descending in the original board.
Example: On the original board, the column could be sorted by 1,2,3,4, N/A, but on the mirrored column, it would only sort by N/A, 1,2,4,3.