I have 2 types of players on the server. PVE and PVP

If I give a player the role: 
"addgroup id7656......... PVE-Gamer 1d" and set the authorization correctly beforehand! After 1 day he goes back to the normal group. But the item which was set to incorrect in the config (CraftingController.cfg). . 

"grenade.molotov": {
"canCraft": false,

remains blocked afterwards even though he is no longer in the group.

Am I doing something wrong ? If he is no longer in the group it should work again?! Before he was moved to the group he was also able to craft it.