Rerouting To Same Route Question

So while IFR on the way back to NY from VA, I was rerouted about five times
which was fine with me (the first four were all shortcuts). What was
interesting was the last "reroute." I was just south of the Cedar Lake VOR
(VCN) on V16 with a clearance from there V16 JFK Direct FRG. Approach calls
me and says "I have a slight reroute for you. Ready to copy?" After my
affirmation, she proceeded to give me VCN V16 CYN "then after Coyle Victor 1
JFK then direct."

For those with a chart handy, you'll notice that V1 overlaps V16 over that
segment so they "rerouted" me to the same route. I didn't see a point in
questioning them especially given the busy freq.

What gives? Can any of you ATC folks shed some light on this harmless yet
interesting experience? A little-known computer quirk, LOA, weird procedure
or something?

Marco