Catch Gallery Doesn’t Show all Images

I am using Catch Gallery with the free Fotografie theme. When I upload images into the gallery, with about 50 images for example, the 25 at the top will show up just fine and about 20 on the bottom half will appear as grey boxes. If you click on these boxes in preview mode, the correct image will appear just fine in the enlarged image view, but when viewing the Tiled Mosiac (used with jetpack) these bottom images will just appear as grey boxes.