plug Signup TOS not working , Show messa You must agree to the Terms of Service in order to signup.

Hi
I install "SIGNUP TOS" plugin,
To registered members page (URL below)
http://rwd-shop.com/pro-site/?action=new_blog
Even if I had agreed to check the terms of service,
Still displays an error message "You must agree to the Terms of Service in order to signup."
So I can not make the next step,
I do not know whether this is a Bug
You can through the website for the actual operation again, you will understand what I said

How can I solve this problem?

thank you very much
Ann