Q: Autofill not working

There is a website that I use frequently. It is a Scrabble site and to start new games you must enter 1. your name, 2. your opponent's name, 3. your email address, 4. your opponent's email address.

Any browser that I have ever used suggests this data automatically after it has been entered once by me. But not Safari. Safari suggests the email addresses from my contact card, the name on my contact card, and for my opponents data I get a list of names from the Contacts App.

I have ALL the checkboxes in autofill checked, even the ones I don't want, to be certain that I am not missing the boat there. Autofill "just works" in Firefox and Chrome. There is nothing to do. The content is suggested after it is filled in once.

I have a Macbook Pro with El Capitain and Safari 10.0.

If anyone out there could help me out with this I'd really appreciate the help!

GL