Insufficient Permission (Failed In i_client_needed_permission_modify_power)

OK,
I have many server groups that are all set up nicely but I want them to be able to add the normal server tag to another user.
Lets call the group trying to add someone is called support, they have these perms:
i_client_permission_modify_power = 55
i_client_needed_permission_modify_power = 70
i_group_modify_power = 55
i_group_needed_modify_power = 70
i_group_member_add_power = 55
i_group_needed_member_add_power = 70
i_group_member_remove_power = 55
i_group_needed_member_remove_power = 70
i_group_permission_modify_power = 55
Grant for all of these is at 75
This group was set up in such a way that super admins could give out the support tags and then support can give out regular tags to people.
The regular tags perms are as follows:
i_client_permission_modify_power = 5
i_client_needed_permission_modify_power = 55
i_group_modify_power = 5
i_group_needed_modify_power = 55
i_group_member_add_power = 5
i_group_needed_member_add_power = 55
i_group_member_remove_power = 5
i_group_needed_member_remove_power = 55
i_group_permission_modify_power = 5
There is no grant on any of these.

The support guys are telling me that they can see the group on the server group list and it is not greyed out, they just cannot add anyone to it because of the insufficient permissions (Failed In i_client_needed_permission_modify_power) error.

This boggles my mind since I have set it up so that the needed powers for the normal group are equal to the perms in the support group.

Any help would be really much appreciated!!!

Insufficient Permission (Failed In i_client_needed_permission_modify_power)