My mesh is deforming strangely when I move it in Pose Mode I made a mesh of a bird and my rigging is almost done. However, the wings are giving me some trouble. Although I'm pretty sure I've weight painted them correctly, when I move the bone, it looks like a wet McDonald's French Fry. I'll attach some images so you can see what I mean.
More details would be helpful..
But I think that top bone some how got unchecked for deforming. Just check in bone section in edit mode.
If I am not wrong then It should work.