It's explained in this thread: http://www.dual-boxing.com/announcement.php?f=15

It's essentially a spam bot protection as said above. I often manually adjust people that post because it's then obvious they're a legitimate account. I've missed this thread until now because of the terrible thread subject. For future reference, be quite descriptive and even call me out directly if there is something you want me to see. Or even PM me. Hop in IRC and say my nick in channel. Hell, IM me. I'm pretty accessible.