It's not going to be looked into though because sad but true the current policy is it's the FC leader/owner's fault for allowing anyone else with the ability to promote others and/or give any other rank besides their own access to the chest. As there isn't any differnce in ranks besides the ones between owner and member in how the game recogonizes them. Is it sad that this happened? Yes. Is your Fc the first to have this happen to them no. Until we somehow get the devs to think like how at least the non jp players think when it comes to how Fc ranks should function I don't see any time soon them changing it.