After looking into reports of PvP Plunder Bonus not appearing correctly it turns out this is a display issue. PvP Plunder is a new concept in Kingdoms at War, and it seems the game client is having issues displaying it in some situations. Right now the Plunder value on your Equipment Page shows 0% on Android devices, and a rounded whole number on iOS. Tapping through to view the specific Item Details will however show you the correct PvP Plunder Bonus of an item.I want to stress that this is only a display issue and that the bonus is indeed being used in calculations on the server side of things. We'll be working to better indicate PvP Plunder Bonus and fix these display issues in an upcoming version of the game.
I did not find the right solution from the internet.
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