Yeah, I noticed it too. I think it's because the rear part that connects the two earflaps together is a little tighter than the helmet itself. This results in the front part of the helmet being pulled slightly against your forehead.
For me, the helmet fits perfectly without the flaps, but I feel a slight pressure (albeit not enough to be uncomfortable) with the flaps on. Maybe I'll think of some way to stretch the rear part and I will be golden.