Simple relay of a bug to whoever cares...

I chose, once inside the ruins, to assist the Great Khans violently escape. I destroyed all NCR forces inside and outside the ruins and returned to Jessup to announce that the way is clear. They proceeded to leave. After I looted the area, I changed into Great Khan armor and exited as well. As soon as I stepped outside they had all become hostile, were waiting right outside, and attacked me. Is this a bug or normal? This happened after the game even announced my Great Khan Fame increase. I didn't harm a single Khan

Try it without wearing the armor. Maybe it's supposed to be worn only by clan members?