It is beginning to sound like it, but traffic would have to be very bad for Waze to route someone through Hudson to get to a Nashua location.
Gottago22, Waze might have been routing you up 3A to cross back over into Nashua at Bridge St, based on what Waze believed to be congestion at that time. Can you give us a rough idea of where in Nashua you were headed? Crown Hill or somewhere like that would make this a little more understandable.