Tried hack squat for the first time

[the People's Champ]

not the hack SLED, but the hack squat. for some reason the bar hits my hams. wtf? are my arms too long? are my legs too short? somehow, I couldn't do this exerxise right without hitting the back of my legs. any advice? I just tried it for a change, something different than front squats(which I LIKE).

 

[the People's Champ]

 

[edgecrusher]

Sometimes the bar hits my hammies to. Don't worry about it, just keeping pulling.