If one side is sitting lower, that sounds like a spring lost it's place on the perch. Very unlikely, but just verify it sits nicely on the perch. Other candidates may be binding swaybar bushings, a loose strut top hat (very unlikely as well).
I'd give the suspension some tugging all over and see that everything looks normal. Likely has nothing to do with your spacers unless they're coming loose, but you can check that they're snug easily enough. Let us know what you find!
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