I've got a few on my wall, with either one or both swept back at various angles. Coronets are in the right place, position and angle on the skull but usually about an inch up the beam they start bending backwards.
Not sure why...
Some ive got are defintely damaged in velvet as the bend is more distinct, others seem to just be a genetic thing.
I once had a roe buck that lived around the house and garden. I watched him for 3 years before finally shooting him and each successive head was swept back....so definitely a genetic thing