Thumbnails Re-Ordering When Video Plays

I’m using this plugin to create a video gallery here: http://www.eastdallascrossfit.com/movement-library-olympic-lifts/

I’m using this custom CSS:
@media (min-width: 980px) {
.container-youtube, .container-vimeo { width: 312px; float: left; margin-right: 15px; margin-bottom: 15px; }
}

When I click on a video in the 3rd column (furthest right) it re-orders the videos on the row below it.

Any idea what’s causing this?

https://wordpress.org/plugins/lazy-load-for-videos/