C2 "Typical Commission"

I was wondering how the "typical commissions" are figured. I ask because I have a system with 50 trades, but the "after typical commission" comes out $3,000 less than the full return! To me, $60/trade does not seem at all "typical".

My system does have a lot of OCO orders. Do the canceled orders still get charged a commission?

I also reverse quite often. Is that assessed 1 commission or 2?