1) Because you have to request that this computation be performed. This switch is on the "Hanger Run Control" dialog back in the input.

2) Because a hanger can only balance the system in one single position. For any other position (load case) the hanger is not balanced. This value gives the extent of that unbalance.

3) Extra (soemwhat useless) information. This is the maximum displacement for the largest hanger in the table.