The fact that a member is able to promote another member to a rank higher than their own is most definitely a bug. It's just a bug that they refuse to acknowledge/fix. Do your research and protect your FCs people, and remember, bigger is not always better. I know several people on my server who are members in FCs that have 200 or even 500 members and no one ever helps them with things. Yet my FC has like 25 people in it and we help everyone in any way we can, everyone has access to the chest tabs and crystals too.