AMP

Hi, I love your plugin – I only need a contact form not all the rest that others add.
my problem is that I have AMP activated on my site.
When you send an email (succesfully delivered) instead of a success message you get a green box which says:

It appears your submission was successful. <small>Even though the server responded OK, it is possible the submission was not processed. Please contact the developer of this form processor to improve this message. Learn more</small>

I’m not up to working out what this means. I het the same message which ever contact form I try!

Any ideas – It seems to be a thing and Google pretty much demands amp from you now.

The page I need help with: [log in to see the link]