I've been helping my brother with his photography site for a while and we've squashed a lot of anomalies along the way. But we've encountered a new issue with how the image thumbnails for the categories appear.
When we had four posts for a category we were fine. Once he added another post, for the same category, instead of the thumbnail dropping into the next logical grid space, it dropped down and moved over three spaces. The next additional post mucked up the category spacing up even further. It dropped down another whole line
If this sounds confusing, I'm sure when you see the page, you'll see the problem:
What can I edit to get these extraneous gaps between category thumbnails to vanish? Something in the category.php file? Or the general stylesheet? If I need to provide more information to help devise a workaround, let me know.