custody order violation issue

Your question is pretty vague.  I can't of course tell you whether his lawyer did say any such thing, or why (if so), but no, generally, the LAST court order remains the court order in effect until and unless the court changes it -- if you showed up at his door with a court order showing that you had custody at that moment, the cops should assist you in enforcing the order.  That said, I don't know what his motion claims (an emergency?  Abuse?  Imminent threat to the children's welfare?) so there are lots of things that could complicate the situation.  I'd suggest consultation, asap, with a qualified family law specialist, having in hand the last order, his current motion, and any correspondence, notes, messages, or other information showing what is really going on and why.