Preview window automatically zooming when mouse hovers over it

Hi, when I have the preview window open and my cursor is over the window the image is automatically zooming out. It only stops if I move the cursor outside the preview window. Could anyone tell me why this is happening? TIA

I can make the preview window zoom with my mouse-wheel.
What kind of computer or operating system?

I’m on Win 10 and I think this might be a good place to start:

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