I have seen several times people wearing stances that are slightly different than the originals. For example I have seen the recruit stance but with the head slightly turning to the right more than usual and the heroic stance, intead of being turned facing its right side its completely facing its left side.
Those stances you see with the guys head looking toward the sky means that he just leveled up/ achieved that SR. It’s the equivalent to you’re emblem shining in reach after you rank up.
There’s a rare bug that causes stances to be shown at improper rotations – for example, a Spartan in the lobby appearing to be looking away from the camera.
Not sure what causes it. Not sure how common it is. Not sure if 343i’s aware of it. But it may be what you’re seeing.
> There are like 13 different stances, with some bearing similarity to others but they are not glitched.
Unless I’m missing something, there are only eight stances. I’ve seen what the OP is referring to, and each time I check the Service Record of such a player, the stance is normal. I think it’s just a minor bug.