Problem/Bug PermissionEx

Hi there!

i am having a problem with essentials chat and permissionex.

when i am typing in chat, whatever the rank is, i've tried them all one by one, i always have the [default] prefix as group.

https://ibb.co/jZfrWbG

here is the perEx .yml

Code:

groups:
  Joueur:
    options:
      default: true
      prefix: Joueur
      suffix: Level1
    permissions:
    - modifyworld.*
    - essentials.sethome
    - essentials.home
    - essentials.warp.list
    - essentials.warp
    - essentials.home.bed
    - essentials.sethome.bed
    - essentials.worlds.<Régiment Tactique Du Québec>
  VIP:
    options:
      default: false
      prefix: VIP
      suffix: Level2
    permissions:
    - modifyworld.*
    - essentials.
    - essentials.sethome
    - essentials.home
    - essentials.warp.list
    - essentials.warp
    - essentials.home.bed
    - essentials.sethome.bed
    - essentials.fly
    - essentials.heal
    - essentials.vanish
    - essentials.back
    - essentials.worlds.<Régiment Tactique Du Québec>
  Moderator:
    options:
      default: false
      prefix: Modo
      suffix: Level3
    permissions:
    - modifyworld.*
    - essentials.
    - essentials.sethome
    - essentials.home
    - essentials.warp.list
    - essentials.warp
    - essentials.home.bed
    - essentials.sethome.bed
    - essentials.gamemode
    - essentials.gamemode.creative
    - essentials.gamemode.survival
    - essentials.heal
    - essentials.vanish
    - essentials.back
    - essentials.worlds.<Régiment Tactique Du Québec>
  Admin:
    options:
      default: false
      prefix: Admin
      suffix: Level*
    permissions:
    - modifyworld.*
    - essentials.*
    - permissions.manage.*
schema-version: 1

In essentialchat, it is format as follow:

format: '&4[&6{GROUP}&4][&r{DISPLAYNAME}&4]&r {MESSAGE}'

but always display in game as:

[default]<playername> <message>