There a few wallpapers in the base game and some DLC where the preview thumbnail appears to be a bit warped. It looks to be squished horizontally, which can give off a wrong idea of what the wallpaper actually looks like.
I do not own all the packs, so there may be some that are not listed here, but those can be reported by people who have the packs that I am missing.
CleanRoom
Stucco'n You - (only on the swatches pointed out in the image)
Pretty in Plaster
Mega Stacked Stone - (only on the swatches pointed out in the image)
[SD] Perfect Vertical Mosaic
[GT] That Wooden Feeling
[GT] Horizontal Planks
[GT] Planks Gallore
[GT] Get Ruins
[DO] Determined Brick
Tested in a game without mods or CC. Tested only on DX11 (though it should be present on any version, as these are just image files).
