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Tim, there may be nothing wrong with the mount 's tracking. I was photographing Orion last night at about 11.00pm with a Nano Tracker. By this time the constellation is past the meridian and the camera will be weighted to the west. If the camera is not attached securely enough it may be slowly moving toward that direction, giving the impression that your mount is not tracking correctly.
Make sure all clamps and connections are tight and weight your camera slightly to the east so that it's weight puts tension on the mount's drive system. This may not be what's happening but can be something to try in an elimination process to find a cause.
Good luck.
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