Grid view not displaying correctly

Hi,

I’m having some weird troubles with the grid view using your theme. At first, it was all ok then all of a sudden it started to display funny. For example, on the home page, there are too big spacings below the articles. The same thing happens on a single category page.

What I’ve noticed is that if I narrow the browser window then expand it again, grid corrects itself on both pages. However, when I refresh the page, grid looks funny once again.

I checked if my custom CSS messed anything up, but it doesn’t seem that way.

Hope you can help!

The page I need help with: [log in to see the link]