Spam users can still sign up?
 

To register on my forum* you need to:

• Enter your date of birth
• Tick the agreement box
• Fill in ReCAPTCHA
• Fill in NoSpam! Verification Questions (13+6 equals etc....)

Somehow* spam bots still manage to sign up* but why?

Surely all of the above should stop them? Due to this we have had to restrict users from being able to create new threads until they have at least 5 posts but i shouldn't have to do this with the above no spam procedures.

Any ideas?

Andy