You'll have to check a couple things. One is cam rotation. On your cam you will see two little holes. they should line up parallel to your string. if they don't, you cam is out of rotation (this WILL affect draw length). Usually twisting you string or cable can get this back in line (this will require a bow press). After the hole line up you have to check your brace height. This measurment is taken from the pivot oint of the grip to the string. the proper brace height for the Mathews Q2 is 7 and one half inches. If it is lower than that, you string and cable have probably stretched and need replaced.