Arch textures is just textures, so it shouldn't matter. The only textures I'm seeing that might be in Arch Textures in the Sky or Water. Which shouldn't be an issue. They are both made by Zaw, so I don't see them being different.
That means that something is messing with your LODs. It is particular with LOD files because of the 3D LODs. If you are using Horizon's Architect Textures you need to either make it an ESM file in xEdit, or unpack the textures and delete the file Commonwealth.Objects.DDS in (textured\Terrain\Commonwealth\Objects\Commonwealth.Objects.DDS). I found that deleting the file worked for me, and the guy who had posted here earlier just made it an ESM and moved it so it was overwritten by Seasons Change ESM and it worked as well.
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But i can't find it in the Architect Files, got the most recent version.
If you are using Horizon's Architect Textures you need to either make it an ESM file in xEdit, or unpack the textures and delete the file Commonwealth.Objects.DDS in (textured\Terrain\Commonwealth\Objects\Commonwealth.Objects.DDS). I found that deleting the file worked for me, and the guy who had posted here earlier just made it an ESM and moved it so it was overwritten by Seasons Change ESM and it worked as well.