Can't type in Email field disabled="disabled"

I have a form to collect an email address as visible here under the E-Book heading:

http://a1fitnessandwellbeing.com/clients/a1fitness/

I can not add text into the field whether I am logged in or not and when I click submit, it tries to load /clients/a1fitness/wp-admin/post.php#gf_2 as the form action.

I have not set any validation on this or requested the user to be logged in or disabled the field so not sure what is going on. I noticed one of the properties set on the input is disabled="disabled" but I don't know what is causing this.

Any ideas as to how I can resolve this please?

The form is added via shortcode in a Spot (http://wordpress.org/extend/plugins/spots/) which is then output as part of the template. I don't know if this is part of the problem? I don't see why it would be.

Just created a new form and added a single email field to it. Saved the form. No section breaks or anything fancy. Tried recreating the form from scratch but same thing happens.

Just tried it on a normal page and it works fine. Presume that means something to do with it being displayed through a Spot is causing the problem? I'm unsure as to why this would be a problem, it's only like a custom post type. Any ideas?

Yes shortcode is [gravityform id=2 title=false description=false ajax=true]