Sounds to me like you're not tracking. I'm not familiar with an EQ8 but it sounds like my EQ6 when there is no sidereal tracking set. Plan B for me would be to put a reticle in and see what a good old fashioned drift tells you. I never had much joy in computerised polar alignment, always found drift easier. Granted a little more time consuming but still.
Good luck but please report back, I for one am curious as to what the issue is.
Wayne
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