R15 character texture is reduced from 1024x1024 to 256x256?

So I have a single 1024x1024 texture on a R15 character, when I upload it from Blender into Roblox studio, the texture on my character is reduced in size all the way down to 256x256 despite humanoid being set to R15.

The issue seems to be the humanoid, whenever I delete it the issue goes away, but obviously I need the humanoid, so does anyone know what to do?

WARNING: GRAPHIC