I have 3 soldiers with different mutations. Somehow, when looking at the mutation screen, the mutations get overwritten. So far only the perceptor head has overwritten the regeneration torso and the judgement head. It looks like the mutation set for one character gets applied to a different character.
I’ve had the same thing happen with gear. This may be a general properties overwriting bug.
Now that you mention it I think the gear did change as well, but not the weapons. I’m not sure.
I had a soldier appear with an exact duplicate of another soldier’s gear, weapons and all.