Vertex group not being deformed?

I assigned vertices to a bone, but they aren’t affected by the bone in pose mode. (except a few random ones)

Selected Verts for the group

Problem in Pose mode

nevermind. I caught my mistake in the screenshots. Mult. was activated…sorry guys.

Try this:

  1. Remove doubles (in Mesh Tools)
  2. Remove all these vertex from other vertex groups.