Game Mechanics: certain runes not stacking

[Cerate]

I had 5 runes of fulguration and 4 runes of attraction in the bank before velious release.
At some point since velious release, or perhaps shortly before, I've looted another rune of fulguration and another rune of attraction. I've noticed that they do not stack with their brothers in the bank or in my bags. They identify the same as their respective brothers.

Other runes, like rune of al'kabor, don't seem to have this problem and stack just fine.
I think I've only been hunting in iceclad, and maybe a few freeport guards. I left all the runes in question in a deluxe toolbox in my inventory, if it helps.

Michaelbay, 38 wizard, blue server.