McAfee scan auto submits forms

It sounds like McAfee's scans are smart enough to fill in captcha fields, which is possible for an automated bot to do (even with spam bots). There isn't much you can do to prevent that. The only suggestion I would have is to try the anti-spam honeypot field on the Advanced tab of the Form Settings and see if that prevents it from happening.

There isn't much we can do to prevent them from filling out the forms, especially if the bot is smart enough to fill in captcha. Maybe the antispam honeypot option will work. It adds an extra (hidden) field to your form that when filled out, doesn't save the form data.

It appears you aren't loading loading the Gravity Forms CSS so the anti-spam honeypot is visible all the time on your form. How are you displaying the form? Via the function call instead of a shortcode? If so, you need to make sure you enqueue the necessary scripts/css using the enqueue function.

You can read about that here:

http://www.gravityhelp.com/documentation/page/Gravity_form_enqueue_scripts

I also noticed your form is tiny, it doesn't fit in the available space and the user may not see the rest of the form when trying to fill it out.