Last night while running Fort B on legend, the dwarf bot died on the first bridge (right after the first tome). Before he could respawn, a player joined and took the dwarf slot. When he loaded in, the game respawned him in the final respawn point of the level, inside the fort.
Then I went down right next to the first grim, and when I respawned, it was right next to the second grim. It goes without saying our run soon failed as the remaining two players could not make it across a significant portion of the map to get to their teammates.
Considering how close most respawn points have been since patch 1.2, I can only assume both respawn points were bugged.