new registration send blank email -> user email blank

When the site is loaded, it is look like pictur 1.
When I click on "REGISTER YOUR ACCOUNT TODAY", it will show the picture 2, directly this page, no page for input anything.

And in my mail, I got mails look like picture 3.

Is it easysocial bug or any mismatch in setting? Why those are blank?

Please resolve this issue. Thank you.