Players can't type in books?

I was trying to make a rules book, and I noticed I couldn't type in my book and quill. I asked a few other players and they couldn't either. There are no errors in the console. I don't know how to fix this problem. Can anyone help?

List of plugins:

Code:

Group Manager
World Edit
NoCheatPlus
Mcore
Vault
PlotMe
Multiverse Core
World Guard
MineResetLite
Protection Stones
Minigames
Survival Games
Ultimate Skygrid
Core Protect
PerWorldPlugins
Chest Shop
Clear Lag
ProtocalLib
Holographic Displays
Votifier
Mob Arena
Prison Rankup
Essentials
LibsDisguises
Multiverse Portals
Multiverse Inventories
Block Hunt
Welcome Book Recoded
Compass Navigation
Enjin Minecraft Plugin
Drop Party
Essentials Chat
Factions
Random Location