Interesting,
I had a thought, they were not bots, they can't even pass the image test, It was from a person uses different proxy IPs. People can create that.......
And lately, I seen reCAPTCHA changing the image slightly different,
But There is one way, is to IP Ban them, or you could use that list to ban them, http://www.stopforumspam.com/
But,
I found two new reCAPTCHA and It looks like the next generation of it. Here are the links,
http://server251.theory.cs.cmu.edu/cgi-bin/sq-pix
http://server251.theory.cs.cmu.edu/cgi-bin/esp-pix/esp-pix
All you got to do is IP Ban them, till you see no spam.
Also, I had four Spams that they f***ed up with my Pilot IDs which it was supposed to be for the staff, EVEN MY SITE ISN"T OPENED!
There are some emails same in that site forumspams that signed up to my VA. I'll start passwording my site.
So you might want to IP Ban them, till it stops.
I'll keep looking into ways to add something to phpVMS. To prevent it.