Spam signups getting passed capture. question

Hello,
I am using recapture.

I am getting many signups with automated data is appears
username, email, name, Bio field
usernamebob usernamebob@someemail.com Joe Schmoe, sujdhs2ghsdgSA2

It is like a hash for one of the buddy press fields.
I am just wondering how they get around the capture?
It is kinda hammering my server cause there content is not getting cache properly because they have cookies turned off.
At this time I don't have their IP because of the setup we are behind.
http://mysiteinc.net/register