Comment 4 for bug 1548522

I am still having this issue even after an upgrade to 16.04 with fresh files. I have narrowed it down to what I think it could be. There seems to be a an issue with the Masonary JS and initial image loading:

http://stackoverflow.com/questions/14089419/on-refreshing-page-masonry-work-ok-but-first-time-overlaps