Out Of Focus Images

I can not seem to get in focus images for my site! I have three sites, and two of them are fine, but the third is off. I used the same image for all my store banners. The one store is out of focus and the others are not. Any help on this?

maybe hdpi is turned on for one store

Where is that located, I will look?

Where is that located, I will look?

Add-ons -> Manage add-ons -> HiDPI displays support

But as far as I know, you cannot enable module only for one store-front