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could be one of several things- for one, some waveforms in nature just aren't symmetrical. Or, could be that some part of the signal path on that spike, which I assume to be your kick or snare, was having a power supply problem resulting in more power to the negative rail than the positive (or the reverse if the polarity was switched somewhere else in the path). Usually this would result in clipping/limiting on whatever side was being deprived. Or, it could be DC offset, but on the one track, not the whole mix.
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