Catagory spam
 

There are several categories/sub categories on my forum. There is one category in particular which seems to get all the spam placed on it. I do have the human recognition/captua system turned on, but I don't understand why I rarely, if ever have a spam problem with any of my categories except for this one category that always takes a spam hit.

I remove this stuff & ban the the users. But I find it odd that its just this one category that keeps getting hit. Do I have something in my admin set up that is not covering all my categories/sub categories. I have not been able to find the weak link in my forum. Any ideas or suggestions would be appreciated.
Greenthing