VT is where the couple married and that’s where the custody agreement is filed. VA is likely following a reciprocity agreement of some sorts. Parents cannot cross state lines and expect the courts of the new state to carry their water for them.
Yes,in the past that's been the case.But today,thanks to filthy state legislators/voters/courts in states like VT there are definitions of the word "parent" that are accepted in one and not in another.Kinda like two guys claiming to be "married".Perfectly cool in,say,Massachusetts but anything but cool in,say,Texas.