You cannot actually exceed 0db in digital audio without clipping which is VERY BAD. However render that out and something has to give. You're working in an environment that is designed to be extremely non destructive. Inside the DAW the mixer is designed to do absolutely whatever and be non destructive so when you "exceed" 0db everything sounds fine.
It sounds a lot like you are clipping the master bus. Mixing is like a giant four dimensional game of tetris, because tracks DO take up space (think of it as frequency range, in one axis, and amplitude, in the other, with stereo spectrum being a third dimension and time a fourth) and you have to fit in all the various pieces in together so you don't breach -0db, which is the maximum amount of space you have in any given instant. If a whole bunch of tracks have dynamic peaks occuring at once, in overlapping frequency ranges, you're almost certainly going to clip, whereas if you have a mix of an alternating kick drum on the downbeats and stacatto acoustic on the upbeats or something, you're not going to be MUCH louder at the master than at the tracks. This is an exaggerated example since this is something you'd never do, and "in nature" tracks are almost never THAT perfectly aligned in frequency content and waveform, but the same principle is true - a whole bunch of tracks at -6db in a mix are going to peak quite a bit above -6db at the master, though the amount, and whether or not that's going to be enough to induce clipping, is going to have a lot to do with the frequency content and dynamic "shape" of those tracks and the arrangement of a song. What happens? The guitar gets significantly louder for being their twice in exactly the same frequencies and stereo image, so when you play back, your master bus is going to show your peaks quite a bit higher than the individual guitar tracks are peaking. Duplicate that guitar track, and leave the copy panned center. Think of it like this - take a project with just a single guitar track.
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