og_promote with the og_mandatory_group

I am using drupal version 4.7.3 and the organic groups module. In addition to that I am using the og_mandatory_group module, so that every user that registers to the site will be added to the default group I have created for this purpose. I have also installed the og_promote module so that I can assign a default role to all members of a group. I currently have the configuration that follows :

1) I have created 3 groups (lets say group01, group02, group03 with group01 being the default group used by the og_mandatory_group module)
2) I have created some roles (lets say role01,role02,role03)
3) Using the og_promote module I said that the users who join group02 will be assigned the role role02.
4) When I register a new user to the site the user is added to the default group (group01) but without being added to group02 he gets the role for that group which I added to og_promote.

For testing purposes I disabled the og_mandatory_group so that when I add a new user to the site he will not be part of any group by default. The user is not assigned to any role now. When I add this user to group02 he gets the proper role, role02 assigned by me to members of group02(from og_promote). Therefore I think (If I got this the right way) that when using the og_mandatory_group there is some kind of confusion with the og_promote module.

Any suggestions on this will trully be appreciated.
Thank you