I just got it with the mesh rebel hoodie about 1 month ago.It is difficult to tell from the picture because its 1" diffrence between M and L is on the chest. The length (front) is 2" diff from 26" in M to 28" in L (so its more apparent).
Even wearing them I can feel the black one is more tailored and snug. The charcoal one feels like regular cut. Hence why i pulled out the measurement tape. It defeats the purpose if I wear a mercer tee underneath but the front accent is covered by the hoodies length.
If it's a month old, it should be the same them. I would contact them. They are good about taking care of things. Comes to stock on these I guess.