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As Allan said, your setup sounds spot on. A dob will occasionally slew almost a full circle rather than a handful of degrees, but I think this is an inbuilt function to avoid wrapping your scope in power cables.
The fact that you said it once slewed 450° suggests to me that there is something a bit fishy with the unit itself. If you're certain the input data is correct and the stars are correct, then something is very amiss.
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