2BEmperor

I confirmed the problem with a low resolution texture mod. Ugly striking half low resolution trees. I use Mod organizer too. No matter what other mods caused the problem, the situation is, When Skyrim read game resources, "files" are the highest priority. If there is a file called "reachtree02.nif" and there is a bsa called "somemod_texture.bsa", inside the bsa it also contains "reachtree02.nif" In this situation, Skyrim always use the file and not the bsa. Even if you set higher load priority in your mod manager use "loot" or something. So if you got a general texture pack, some files must be conflict with simply bigger trees. Your texture mod must be have not packing their files as bsa, they list the file to disk directly. By default simply bigger trees use bsa so it can't get higher load priority in any event. Temporary solution is use bsa explorer extract the "SimplyBiggerTreesSE.bsa" and "SimplyBiggerTreesSE - Textures.bsa". Take the extracted two folder "meshes" and "textures" to the folder that Mod Organizer used to install mods. let's say, put these two folder with the file "SimplyBiggerTreesSE.esp" together in a same folder where it's installed. Then, give simply bigger trees SE priority higher than your texture pack, start the game, poof, no ugly cut trees anymore. But the trees will show as vanilla style instead of your texture pack. Because you're using simply bigger trees style texture for trees, and it's the same as vanilla. I'm not a modder so I can't adjust the style, I just accept it. I want bigger trees anyway. Hope it would help.