GW2, DC-10-30CF, Pax limited to 140 but all calculations are still performed with a capacity of 179. The return flight should gain at least 3500kgs cargo capacity based on ~100kgs/pax plus bags, but it seems the limit is unchanged from before the seats were blocked.
Edit: The issue seems to be with the automatic seat blocking feature. If I manually set the limit to 140 pax, it is displayed correctly and the cargo capacity in both directions increases by 4,000kgs. (3rd image)