hello, i have got a problem with the permissions

i edited this value "i_group_modify_power" to a lower value than "i_group_needed_modify_power" for the groupe "Server Admin" so i cannot change it back and i am no longer able to change anything for server groups.

Is there a way back??

Why does every group has its one "needed" values?? Isn't it better to use thoses values global????