MasterOfWP on "Contact Form 7 and Really Simple CAPTCHA"

Hi,

I noticed little problem when I am using Contact Form 7 and Really Simple CAPTCHA. When I make form without CAPTCHA and press Submit, mail left and I got message that mail is successfully send. But if I and CAPTCHA and try mail sending, that little circle keep rotating but mail left successfully. So that reply message in site is the problem.

So how I can fix that?

http://wordpress.org/extend/plugins/contact-form-7/