send email activation to new users

Hello,
i have two plans on my site. One free and one payed. If i register a free user then it gets activated automatically, even thought i have checked the send activation mail in configuration. Any ideas?

Also when a duplicate email or user name exists the system does not recognize it! and it creates another user with the same username and pass.

Also i just noticed that even if i do not fill any of the fields required non required the system continues the registration and gives me the following table,see attached picture.

It seems that the whole system does not work ,meaning that it does not check for the required fields, does not check for duplicate emails or usernames. It just goes on with the registration. In the image bellow i went to the free plan that i created and i just pressed purchase.

Thx very much,
George