It seems that if you have a pulsewave rifle out and are in combat, moving in any diagonal direction gives your character a funny-looking gait to their step. It's pretty odd, and I haven't seen this happen ever before (noticed it when playing today, haven't played since Thursday).
So far I haven't found this to happen with any other weapon type.
I keep thinking this and a lot of the other animation aberration you see with shooter mode would go aways if they shortened the shooting animation or how long the toon holds in that pose after they fire. I?ve rather often not had it look right when I fire a second shot with any weapon because my toons still seems stuck aiming at the first mod which is lying dead. while I?m already targeting and firing on a second mob which makes the beam/blob of light come out of the gun sideways or or backwards depending on how much i?ve rotated to aim.