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There is a couple of things in those images.
In the first one I can see baffle rings, they are really obvious. That combined with the out of focus stars on the outside of the field indicates that the field is not flat. Return the scope, it clearly has problems.
In the second image the stars are out of focus on the outside of the image and sharp in the center. Collimation should be addressed but this will not stop the out of focus stars. Are you absolutely certain that collimation is done correctly?
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