ouh ok dude..this happens to me as well..so i am from a group lvl 8..with group skills maxed at lvl 40..when i decided to make a new group and when i left..i lose about 4k power..so basically 1lvl overall of group skills is about 100 power...when i made that new group i only got back 500 power..and since the group is new..the max lvl for the group skills is lvl 5..that means when u jump to a different group..when ur group skills is higher than the group max lvl..the rest of that skill lvl doesnt count