Looks like you share an IP address with a number of other users. Did you previously submit any applications that you never received a response to? Often such applications are approved and the player assumes it was declined since they did not receive the mail.
If that is not the case, I would guess that you are simply using a larger ISP, which tends to share IP addresses between many different users. If that is the case, just register again and you should be approved. You may want to post your handle here once you have done so, as a reminder in case one of the people doing join requests checks here first so they don't decline.