Why do my UV maps appear improperly when I bake lighting?

@ Archii did you miss the UV map on the tower at the side and the part where I said it looks fine in Unity? Also it’s fine before lightmapping :D…

@ Jacky I’ll try the lightmass importance volume as this is a large scene and it has been complaining about it.

I really wouldn’t like to generate new UV’s for the 28,000 assets we have. If I have to that’s a UE4 deal breaker.