Hey again 8!,
I noticed in your ‘World Outliner’ you have three different light sources. Perhaps try narrowing it down to two. Have your ‘Dominant Directional Light’ (try setting to movable) and your ‘Skylight’. There is also a setting within your ‘Skylight’ which could be the cause of your issue as well. Try re-checking the ‘Lower Hemisphere is Black’ option.
If none of these suggestions work for you let me know. If you would like, you can send me a private message on the Forums with an external link, like DropBox or a shared Drive folder in which I can grab the project to test on my end.
Cheers,