Registering and bypassing required fields?

I just had two accounts created that did not check a required box and required drop down select on the sign up. The required profile/registration question is simply "Do You Agree to the Rules" and the 'yes' must be checked. And the other is "male, female, prefer not to answer" and one must be checked When you look at a member profile you will see the Do You Agree to the Rules with Yes, and the Gender selection but these two new accounts (created by the same person/IP) somehow bypassed them. Any ideas?