It's because the game is based on the source engine. Left 4 Dead does this as well. You are getting a larger FOV, so that's not really an issue. Source Engine just groups certain resolutions together and 16:9 is the closest Aspect ratio in it's list. This happens to me and I'm running 48:10 (7680x1600).
_________________ System Core: | Intel Core i5-2500K + ASUS P8Z68-V + 16GB Corsair XMS3 DDR3 1333 MHz | Win7 x64 | MSI R7970 Lightning 3GB [1105/1400] | Display: | 3 x Dell Ultrasharp 3007WFP-HC @ 7680x1600 | Dell u3011 |
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