I will agree with Mark.  Happened to me around Ksea in the rockies.
My choice of STAR/TRANS created all this extra routes at the same time on the ND.  Out 100nm and back
I got worse around the airport, with the missed approach and the hold.
( and a bunch of new waypoints I had to follow manual to bring the plane to my runway of choice ) My plane followed the TRANS but not the STAR itself.
You train to be ready for the unexpected !!! ;D   ;D

Raymond      Boeing or nothing
New KFLL      South Florida