I've recently downloaded a few graphics mods using Vortex. (So much better than the old NMM)
1. Majestic Mountains
Lightweight Grass Overhaul
Noble Skyrim Full Pack
Really Blended Roads
There is quite a bit of overlap between these mods, but I'm happy with how the game looks... Mostly. Around Fort Dawnguard there are a couple rock formations that are seriously glitching out graphics wise. I haven't seen this anywhere else in the game.
Hopefully you can see what I mean (Cursor is right on where I saw the glitch first). I have no idea how to go about fixing this other than to remove mods.
I assume it's from conflicting meshes or textures... But I thought that they would be overwritten by the last loaded mod, or at least what is specified.
https://imgur.com/TFNWD3J (Fort Dawnguard mountain)
https://imgur.com/ZcMNVRc (Fort Dawnguard exit cave)
https://imgur.com/BVS68TV (Fort Dawnguard exit cave)