NY/Parallel Compression - Questions

[ansanity]

When blending original drum tracks with a stereo aux with a compressed signal, has anyone found that it messes up the stereo spectrum? For instance, I've found that when I use this technique, that the toms sound weird when I do this... a tom hit from the original track sounds like it's coming from somewhere else in the stereo spectrum than the same compressed tom hit in the stereo bus. The don't line up and the mix loses its tightness. Has anyone else ever experienced this when using this technique?