Hi Team! We happened to run APQ with 3 pairs of married couples and encountered this issue/bug where two of our members had to teleport down in the map and 'complete' the couples bonus stage before we could go into the actual bonus stage. This behaviour can be seen in the video below (fast forward to pre-bonus stage 09:15): This is what Amos says when the party leader clicks on him:
This is not bug. The extra stage requires you to collect 20 (or 30? i can't remember) etc from mobs and use the invisible portals to climb up so you can click Amos. It then rewards some bonus exp, and at an unknown chance, a cape that probably no one has yet obtained on the server.