The most common cause of inaccurate results in SharpCap Polar Alignment is something moving or flexing as the mount is being rotated. For instance, if the guide scope or camera is not fixed firmly then it could shift as the rotation happens leading to wrong results. Even the weight of a dangling USB cable trailing from the camera can have noticeable effects.
See the Polar Alignment Troubleshooting page to find out how to diagnose and fix this problem.
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Polar Alignment