Guild Wars 2

I use tahlkora’s armor with 6/6 superior rune of mercy, but now I wanted to change it to 6/6 superior rune of the undead only it says now 12/6 superior rune of the undead and when I equip it, the stats of the rune don’t change my stats, is this a bug or did i just mess up the armor?

It’s showing your pvp rune setup added to your pve setup. Basically it’s a display bug, your armor is fine. Mine did that with the Superior Runes of the Guardian. I tested it in the mists first, and then went ‘real-world’ with it and got the same effect.