Un-weighted painted vertices moving with bone

Question

I am trying to rig my model and need to weight paint the bones to the proper body parts. I chose to parent my model to the rig using empty groups, but after adding weight paint to, for example, the leg, this occurs: https://gyazo.com/7a71be9641c3366da4dde5027e725459 .

Could this be because I haven't finished weighting all of the bones? Why is this occurring and how do I fix it? I apologize if this has already been asked.

Answer 1

Try checking to see if any child bones (bones which move when you move the "parent" bone) of the bone you are moving have weight on the problem area.