I have recently gotten one of these targets from an uncle of mine and used it for the first time the other day. I have found that the target works well as far as recieving the broadheads and removing them. But my question/concern is that 3 out of every 4 broadheads did not open in the target ( mech. broadheads). Is this common for these targets? If anyone has one of these or knows the answer please let me know. Just want to make sure that the broadheads are functioning properly before I head out there.