It's not a glitch. It's simply that the default aspect ratio for the menus is 16:9 and ordinarily it squashes that up to fit on screens with ratios that aren't quite as wide. Roadczar has 16:9 monitors, so it scales perfectly to his centre screen. Your monitors however (and mine) are 16:10 and if you used a single monitor it would squash the sides in. You're not using one physical screen though, Eyefinity is telling your PC that you have a single monitor with a ratio of 24:5 and the game figures it's just sticking the menu in the middle of it, hence the bits hanging over the sides.
If you watch a 16:9 movie on your PC with Eyefinity enabled you'll see the same thing happen. Ironically, it's your bezel compensation that's making life difficult. Normally you'd still be able to see those extra bits, just hanging off each side. With compensation on, most of that would be hidden behind the bezels - but you already know that, hence this thread!
By the way, you're spot on about performance and Eyefinity. I've got a pair of 2GB 6950's and they struggle. Even with a single monitor, I see sub-70fps over the channel and on the ground in the First Solo training mission I get under 20fps depending on which way I'm looking. Roadczar is running a pair of 6990's (effectively quad-fire) and still has all his settings on Medium to get it running smoothly.
TL/DR - It's working as intended and will happen in any game/app where a screen is scaled down from 16:9 rather than scaled up from 4:3 or based on relative coordinates.
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