/3/ - 3DCG

>>478575
I would recommend baking outside of Zbrush with Xnormal just to avoid this bug.

BUT If you do take the Zbrush route:

Go through the normal steps of generating your maps and exporting them and your model.
Check out your model with the textures in an external program - If the exported model has incorrect UVs all you have to do is go back into Zbrush and hit this button in the UV map tab (FlipV) and re-export the model only.

This will make your maps display incorrectly inside Zbrush but they should display correctly in any external program. I don't know why Zbrush does this sometimes but it does.