One of my Hearthlings was copying all animations another Hearthling made. In this case it was my weaver copying the mason.
When the mason moves the weaver had a walking animation while standing still. When the mason picked something up or crafted something the weaver did the same motions with his hands.
I created a small video to showcase the issue: Weaver wants to be a mason GIF | Create, Discover and Share on Gfycat
The Weaver is the balding guy in blue, the mason wears orange.
Version Number and Mods in use:
This happened in Alpha 19 (Build 687) without any mods.
No dedicated GPU