So i have to readjust the uv in blender.
Any idea what causes this?
Have you tried to adjust the export-import preferences in the preferences menu? It has settings for adjusting any type of flipping.
When you say mirrored, do you mean flipped?
Thanks Altea, it was checked on “Normal map flipped vert” ( Why is it checked by default?.. ).
I didn’t check if it fixed it because I already went through with the output it gave me before, but now i will know where to modify it.