That most reminds me of an area where's there's no light at all, you get the weird coloured shadows in that too. So yeah, check the lights aren't inside the props or anything (maybe check the shadows on some of those vent fans as well).
Emh, I had weird black shadows in my blu spawn when there were a few leaks in my map. When I fixed those leaks the weird black and dark shadows were gone.
That happens to me sometime, models are lit but world geometry isn't...
Try deleting the lights and adding new ones, if that's what the problem is, I can't tell for sure
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