Can't Grade Up?

[CreeperLex]

i've been playing for multiple days now and whenever I type /grade it says I have a certain amount of time until I reach the next grade, but the timer keeps restarting and I can never get past grade 7. How do I grade up?

 

[CreeperLex]

But it doesnt do that. It did that the first time but now the time just continues to restart when it reaches the end and i never grade up