Try deleting your cache please.

Or follow theese steps below :

Open My computer -> Local Disc (C:) -> Users -> The folder named after your computer -> .emps_world -> 667 -> Sprites -> skillchat
Now change the name of Hunter icon from "skill_22" to "skill_21" and the name of Construction from "skill_21" to "skill_22" (Deleting Hunter and Construction icon and then restarting client should works also)