It may be all people, but I know some people aren't able to use the rank command.
The rank gui isn't appearing when people type rank, it just does nothing now.

It may be fixed by now, but it wasn't working for the past about two hours I was playing, I just got off the server a few moments ago.
Anyway, I don't know why this issue is happening to some or all of us.

Thank you for reading this boring server problem that isn't much of a big deal to some players. Lol.