Using grid course format show courses in Joomla

i'm using the grid course format in some moodle courses. I can see the courses in Joomla and I can purchase them in Hikashop but when I go to My Courses it's blank.

When using the topics or weekly format it works well.

is it a simple incompatibility between Joomdle and the grid format or it could be a bug?

Not sure what is happening.

I just installed the grid course format, created a course, and enroled a user manually.
Then logged as the user on joomla, and the ocurse appears in "my courses" just fine.

Thanks Antonio for the quick answer.

I ewill try to reinstall the format again.