Glitched Lighting

Whenever I’m a certain distance away from something that’s being lit, all this ^ starts to happen. I don’t know whether I just don’t notice it as much on other maps, but it tends to happen primarily on gm_black. Also, it’s usually not this bad, with just some slight corners being glitched.

Anyone know a fix for this? Any help is appreciated.

I’d also like to point out that this doesn’t always happen, only angles and such and such. Obviously enough to cause significant problem, though.