After upgrading to the latest High Sierra (10.13.3) I cannot open an image into a new layer in Photoshop CC. The new image makes a background copy. I've been using PS for many years and have never had this problem. VERY frustrating!
I don't know anything about your specific problem, but there is a list of OSX Photoshop known issues here:
Known issues - Running Photoshop CC on macOS 10.13 High Sierra
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