ORIGINAL: ghemry
I would guess your bow is out of tune. Think as the broadhead as a giant fin. If they are shooting low I would guess your knock is to high. Shoot field points and broadheads at 30 yds. When they both shoot the same point the bow is tuned. Paper tune your bow, my guess is knock is to high.
That is my suggestion. Your bow is probably off. Rest got bumped, pins got bumped, nocking point is off.
Paper tuning would do wonders. ghemry I believe...is right on.