Coursepress enrollment problem

Hi,
I have installed coursepress in a new website.
In the course detail the "Register" button is missing!
See it in:
http://esteticalatina.com/academy/courses/soprano-ice-increase-your-business-revenue/

In the course configuration, in the dropdown "who can enroll", the "anybody" option is also missing. Instead, there is the "Registered" option.

In other websites, this is not happening. (see here: http://estheticnet.com/dest/academy/ultimas-tecnologias-en-aparatologia-estetica/)

How can I solve that?

Thanks!