Grushnak pride

[ghostbuster]

Already cleared the 3 previous prides, but I have an annoying problem in Grushnak.

I entered a small room (guarded barracks), destroyed the orcs there, and tried to open the door. There are 2 levers, but they do not seem to work. They seem to behave differently from the levers in the other prides and absolutely nothing happens when trying to walk on them...

Am I missing something, an item, a key, a quest or whatever, or is it a bug?

Edit: Found the problem. I disactivated probability travel and the levers work!!!