Why are my images distorted when view them in full view in Catalina?

I hope you can help me with my images being distorted when looking at them full view in Catalina (27″ Apple iMac EMC 2639)

See the two images below… the one on the left is a clear image of a puppy and then, as soon as I click on it to expanse, the image just becomes distorted as shown on the right

I even tried a different viewer app with same result



Source : Link , Question Author : MrRoberts , Answer Author : Community

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