Expertise of ret paladin

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My expertise 104 rating and +12 on game.
But ask mr.robot say +13.
I wonder if it counts correctly.
And is it correct that the +10 due to the seal of vengeance glyph is also counted?
Thanks.

104 rating gives 12.69 expertise. The game UI rounds things strangely so don’t trust it. Behind the scenes, I believe the game uses the non-rounded value.

Our calculations account for everything, including glyphs.