2 squares on lower sides where the directional light has no effect

What could be causing this? It is only the directional light that does this. If I make the squares go over a point light I can see the light coming from it.

I closed UE4 and reopened my project and they are gone.

I find that happen alot for me to… the texture get funky and crazy even out of order, make me go nuts lol then when i say i go sleep on it wake up next morning and it all gone and everything back to normal…

Just an engine bug.