I’m new to Blender and trying to rig a head but the head and body are one mesh so I used weight painting to make sure the head bone only controlled the head. When I rotate the head bone the head deforms, with part of it staying in place rather than moving as one unit. The entire head is uniformly weight painted so I’m not sure why this happens. I also checked to make sure none of the other bones have weight painted control over this area in the head.
I am unable to add an attachment so I have a video link of what is happening here: https://imgur.com/a/hJbVS41
Also as a side note I have no idea why the hands move when I move the head (there is no weight paint there).
Any help with these two issues would be greatly appreciated.