I've got a feeling you may be refering to a post of mine. If you are I'll explaine a bit better, if not please excuse me. I was under the impression that the individual may have a dl that is too long for them. If this is the case and they are stretching to make the draw this could be causeing the issue. It has happened to me in the past.

By shortening the dl and bending the bow arm the issue is remedied.