Can't buy Tier 3 flat Armor seal runes and flat Magic Resist glyph runes

It's strange, I can buy literally every rune in the game except these two. I can get flat Armor marks, Magic Resist seals etc. but I can't buy the most powerful ones for some reason. [Here's what happens when I try to buy them:]( I tried to turn off the game and login again but I still can't buy them.
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