Plugin Help Prison 2 No ranks above 'C'

Fell free to check the the console feed included, i'll try and read it myself aswell but if you look, you cant really see but there are ranks a,b,c,d,e,f and you get stuk in a coninuous loop from a,b,c and cant rankup to e or f. THIS IS MAKING ME SALTY HELP

Pastebins:
http://pastebin.com/X4tfM0Ur
Prison 2 Config:

Code:

#======= Prison 2.0 Configuration =======#
# (C) 2015 TheOneAndOnlyDMP9, SirFaizdat #
#========================================#

server-prefix: "&4Prison &7>"
check-updates: false

reset-time: 3
reset-warnings: [10,5,1]
fill-mode: true

prison-warp-gui-title: "&1&lPrison Warps"
reset-warning-message: "&6Mines will reset in &6<mins> &6minutes!"
reset-broadcast-message: "&a&lMines have been reset!"

multiworld: false
world-list: [plots, mines]

autosmelt-on-warp: false

warps:
  total: 0

dmp9core:
  # DMP9 Core is something used in prison so DMP9
  # can use his style of data to manage the plugin.
  # Normally, this section of config should be left
  # alone.
  warpdata:
    amountCreated: 0
    dmp9coredatacode: ""