This problem is regarding the arena spectator system, you'll have to open a bug tracker report.
It seems that when you assume the morph of a specific model - such as the draenei that I saw in one of your last screenshots - it changes your hair style to the corresponding one used in the NPC, such as hairstyle model 1, 2, 3 and etc(same for colors, that are also counted as numbers).
I've seen another thread like this one before and this seems to be the problem, maybe it is something related specificly to a specific set of human characteristics(such as skin tone 1, hair style 1, etc)? This seems to require a lot of testing so I can notice the patterns.