MTX texture (Temple Weapon) is extremely low-res. Is it PoE or me?

Just picked up the Temple Weapon Skin MTX off today's sale, and I've got to say the in-game texture appears to be of a FAR lower resolution than the preview. This means the inlay looks like a stretched, blurry mess instead of anything coherent?

Still image of preview video (1H version)



Notice how well-defined the inlay pattern is. Of course it's too small for there to be definite images, but the black clearly contrasts with the blade edge nicely and the gold picks out a pattern even if it's more hinted at than defnite.

Now compare screenshots from in-game.

Without AA:



With AA:



Er... what the heck happened?

I play with the textures set to the highest quality the client is allowing me (High), so that's not the issue. Played with some other settings but nothing really changed?

Can anyone explain to me what's going on? Is it something I can fix? Is this a bug related to texture streaming?