Hello Valerie,
In your case it usually means that preview images or thumbnails are smaller by size than the Gallery itself. You should adjust image dimensions to match gallery actual size or change size of gallery thumbnails&preview according to your images size. Thumbnails size you can set by going to Preferences > Website preferences, then scroll down and check for background&lightbox settings. Or you can adjust your images, just set resizing parameters manually when you add your images to the gallery.
Best regards,
Eric Curtis
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