Strange. Have you checked that expander ring for inconsistencies and ensured it is installed correctly? Next step would be to try mixing up parts as suggested above.
Quote:
Originally Posted by haysonj
Once they seat I find it hard to believe they move
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^^ Not so much when everything is new. Rings will move more once the cylinders take on a bell shape, and piston skirts wear allowing them to rock in the bore. On a few occasions I have seen a high mileage engine smoke like a freight train from one or more cylinders, then clear itself out. No doubt because the end gaps lined up for a time.