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Its tilt.
Something in your imaging train is not square. Stars are nice and round bottom left and whacked out on the right.
I am not an expert in collimation but I would have though that would give comet shaped stars near the edges rather than round in the L corner and elongated on the right side.
You should be using screw together type adapters. If you are using a eyepiece holder then that may be your problem. Screw together adapters ensure squareness.
If the scope is fast all this gets exaggerated and needs to be more precise.
Put your camera doing continuous focus images and try reseating it in the setup to see if it improves.
I used spark plug spacers as packers to get my setup square at times. It worked well. It only took 10 minutes as above.
Greg.
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