Why do all images say Winner? above the thumbnail in the backend gallery?

Probably obvious but I am puzzled why all images say winner above the thumbnail in the back-end gallery. There is a button to manually set winners too but makes no difference to the grey WINNER in the top left above the thumbnail.

I am using multiple stars and, if anything I would expect the highest rated images to say winner rather than just the tick on the winner button.

I think I may have missed a how to or a why bit of the documentation


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