This is how my game looked laely, both here and at my GFs computer. Night in the first game window and day in the other?? Has somone else simlar?? I cant recall that is changes really...
on the main razor page you can filter out light levels, it looks like one of your client has this option checked.
Not entirely sure how the day/night cycle works, but it seems the sun indeed rises, it's not a "switch" for the whole map. If you are patient enough, when the light hits you you could run W (I think) and the light will "follow" you. That means if you are fast enough you could actually never see the light of the day and rp as a vampire! Also, real men play with "dark night" option on and carry torches.