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I've had this happen to me in the past when during the 2-star/polar alignment cycle one of the alignment stars slipped past the meridian and I ignored that.
It has not happened to me (to that degree) when I stuck to the same stars for 2-star and polar alignment and stayed on one side of the meridian.
On occasion I did notice my polar alignment going around in circles (refusing to get better than about 1 arc minute), I believe that was when 2-star alignment was inaccurate due to poor choice of alignment stars.
Cheers
Steffen.
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