It's because the drummer hit off to the side of the side, i.e. rimshot, so it's really pingy and the other mics picked it up real bad. For the blast beats though it sounds fine, as you can hear, it's just the hard hits where he does this. The toms are gated really tight, and the OH/ride/hat mics are all sidechained and are ducking the snare, but the ping is still dominant even on just the snare track. I almost gave up on this project because of it, but the band didn't mind the sound. All that said, it does sound kinda cool when they are doing the slow stuff...but I wanted to re-track the drums regardless, they didn't think that was necessary. Hey...as long as they are happy with it right?
Oh, and the left side is FireBall, right side is Bugera.