Heyho,
I’ve not found a topic for this, if there is one already, please ignore or delete mine. 
Right now playing Alpha 12, release-465 (x64) and I have found the following:
Fine Bed Model (see the two yellow dots, the right one is offcenter)
Now as soon as someone lays down the yellow dot on the right jumps to the “right” position:
I think you use two models (one without Hearthling, one with sleeping Hearthling) so the first model should have the wrong voxel.
~ch1ck3n 