"Please fill out the form on the previous page" problem again.

I know there are other posts with this same problem but even after reading them and after reading all other posts I still cannot solve this problem.

Firstly I would like to point out that even the demo page – Here is showing the same problem. After filling in the email address and/or check the checkbox and click next I get the following message:

Enter more info before the email is sent.

Please fill out the form on the previous page

Now on my website, I am getting the

Please fill out the form on the previous page

after filling the first form, and I also notice that on pressing next on the first form, the whole page refreshes and not just the form (don’t know if this is part of the problem or not). How can I solve this?

Any help is much appreciated! Thank you.

http://wordpress.org/plugins/contact-form-7-multi-step-module/