Map won't build complete lighting

Hi guys so I’m having a major freaking problem with my level and I’d really appreciate some help. So the problem I had is that when I tried to build lighting it didn’t re-build everything so I have weird lines on my landscape and lights aren’t showing up properly.
Now I’ve tried wiping the static lighting clean and building again. I’ve tried duplicating the map. I’ve tried migrating the entire project and Im going to try and open a copy in an updated version. I’m currently using 4.8.3 and wil update to 4.9.2,
If anyone has any suggestions as to how to fix please recommend. There are no real errors when I go into map-check, but it builds lighting far too quickly so it’s like it’s not doing the process completely or something.

Hey Atomic artist,
If you attempting to build the lighting for a terrain, chances are it is too big. Instead what you could have is a ll dynamic light. What I would do is go under the settings → world settings → and enable “Force no precomputed lighting”.

Yes this may work.

If you are going to build the light for your terrain, I recommend you have at least 16, if not bigger, gigs of RAM or you system may freeze.