Actor is dark until I reposition it. (see video)

Here is a 15 second video that shows the problem I’ve been having:

My actors are always dark whenever I start UE, and whenever I build lighting.

They are well lit only after I move them.
After I move the actor in any direction, then the actor is well lit.

Even if I move the actor back to its original position, it remains well lit.
But after I build lighting or start Unreal Engine again, the actor goes back to dark.

Does anyone understand what is going on?

Either your lighting isn’t bright enough or your lightmap UV’s are not properly set up. When you move an object with baked lighting you need to rebuild lighting (hence the message in the top left corner) and the reason it looks brightly lit is because it is using dynamic lighting.

Thank you very much!!
I’m certain the lighting is bright enough.
I’ve tried putting several large, bright light sources around the actor but the problem is still there.

Same problem for almost all the things in the house (including the walls, floors, any objects.

I don’t think I need dynamic lighting.
Can I turn it off somewhere?

Also, you’re probably right that my lightmap UV’s are not properly set up because I don’t know anything about that.