OK! I did some testing. First, the settings.





Here's a shot of the virtual visit. Note in the windows on either side of the sliding door the horizon where the sky meets the ground.



Here's the first render with the lights in place.



and with the two track lights and the ceiling fan light closest to the wall hidden.



I then changed from the Big sun to the Very cloudy sky texture, thinking it might be the Big sun texture.



It looks like, for some reason, the ground is showing night but the sky isn't.