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Check everything for square - measure corner to corner on each face or use a large square if you have one, then check for level. If it isn't square, it can never be level on all axes simultaneously.
Also, check the accuracy of your levels. Hold them on a surface, note the bubble position, then flip 180 degrees on the same spot - if the bubble isn't in an identical position, the level is borked.
So what am i missing - everything is perrrrrfectly level. but I have a lean that makes the top out by a few mm compared to the bottom.
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