Hi, So i create my Minecraft plugin and, something are wrong, let me explain : When i have create my Gui ( inventory ) and when we take an item in a slot that like we take the item in the Gui and the item in us personal inventory. Look this video : This is the same for some slots on armor like ( 6; 7; 8; 9) ( I start count from 1, not 0 ). So, if u have any idea / solutions, there are welcome ! Code is in attached files. ( I use Spigot 1.8 ) Ps : I'm sorry for my English.