I am creating a slideshow, and one slide (only one) is coming up with a border when I preview, play, or export the slideshow. It's a wider black border in Play than in Preview. In the Library and in Develop, the image has no border. Stroke Border is unchecked; Zoom to Fill Screen checked. The rest of the 50 slides render fine--without a border. I've tried deleting/reloading the photo into LrC, with the same result. MacOS 11.2.3. Anyone have any ideas?