New logos destroy grid layout

This plugin is used in multiple places on the website I help manage — recently when I add a new image to one of my smart logo pages, the logos are no longer aligned and viewed as a grid but rather all different sizes and not in a grid. My other smart logo pages are not experiencing this issue. Any idea what the problem may be? I re-made the page and that fixed the issue, but only temporarily as when I added a new image the same thing occurred again. Once the newly uploaded image was removed, everything went back to normal.