Weird Dark Spots on Flat,One Face Meshes - Need help ASAP - Project Due Soon

I’ve been using Unreal Engine for the past 2 years. I have created 3 environments from scratch that I have put into Unreal Engine and I have never encountered this issue. After baking the lighting, I get this weird black spot on 2 different meshes.

These meshes are flat and have one face. One of these meshes is repeated over 100 times and only this one has that issue. Above this mesh, the area is lit as if there is a light above it.

I have looked all over the internet and can’t seem to find anybody who has had the same issue. This project is due very soon so I would greatly appreciate the help as soon as possible, thank you!