OK, i just bought this vectrix this month and have shot it less than 100 times. i started noticing that every couple of shots, the string wouldnt hit the sts system where it should, it would slip off the side and get stuck there until i pulled back the next time. i also noticed that on these shots the arrow was thrown off. well heres the pics any help on how to fix or whats wrong in the first place would help.

thats normal above, below is the shot that throws off the arrow



is this bad? is there any way of sliding the sts over so that the string wont slide off the side? does anyone else have this problem?