Ranks not showing correctly

I’m master in KOTH but on the leaderboards it says im diamond 3, this has happened before but whenever i move up a tier it corrects itself. However i can’t do that with master, will this update if i give it a bit more time or am i royally screwed?

Also if i don’t play KOTH for a while will i be knocked out of master rank, do i have to keep earning tier points to stay in master? and will rewards be given for the tier you achieved or the tier you currently are