anti-splog doesn't identify splogs and spammers

i'm using anti-splog and having issues with it as spammers and splogs still succeed in registering.
last night, more than 30 spammers/splogs made it through the registration. the weird part is that wordpress identifies most of them as spammers (as in the "users" tab it adds them to spam list and mark them in red), but anti-splog doesn't even add them them to "suspected splogs" tab.

any ideas?