Member's don't appear on "All Members" tab in plugin

HI there,
Although the correct membership role is being applied, new members are not appearing in the "All Members" tab of the plugin.

This means there is no way to monitor which users are under which subscription, or to get information like when they joined, etc.

And please note, the only custom files were those of a payment gateway, but I was successful in making payment, and there is a level of membership which is free which is also not showing up after registration on the "All Members" tab.

Please can you have a look and advise.