I experienced the exact same Monday night with my HEQ5 mount. I’ve never experienced it before. I ydes the ASTAP solver, but everytime I moved the star into the middle of the crosshair my error had increased by 2-10’. I tried 3 times all with the same result. Then tried switching to the internal astronomy.net solver and suddenly my error decreased (that is, without making any adjustments to my mount!). One aligment routine later and my error was 11”. One additional run of the PA routine (just to check the error - so no adjustments made) again gave me an 11” error.

It seems my problems got cured by switching from the ASTAP solver to the offline astronomy.net solver.

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