Fixing the upside-down textures is as simple as editing the UVs on a model editor.
I assume you'd just need to mirror the Y-axis on all the texture's UV.
EDIT: I'd also look into texture clamping to see if there's anything off with them.
I assume you'd just need to mirror the Y-axis on all the texture's UV.
EDIT: I'd also look into texture clamping to see if there's anything off with them.