ORIGINAL: drockw
ORIGINAL: TFOX
A friend of mine had the exact same issue as you.He took it by the tru ball booth at one of the ASA shoots and with 1 glance,the person said it was adjusted wrong.He adjusted the top screw back in and readjusted the screw on the back and then reset the top screw and it was fine.Took him about 2 minutes.
that is what is happening to one of my buddies (Scott). He has a 360 though and the adjustment screw seems to keep working its way out.
Many people adjust the top screw when the back screw is not adjusted properly,putting it out of sinc.It didn't back out on him,he just adjusted it wrong.