Blog posts overlapping

Hi,
I’m having some trouble with the default posts page. My posts keep overlapping and the images below start covering up the text from the previous post. Not sure why this is happening. At first I thought maybe it was the load time of the images, but images are loading quickly for me and even so one they did load they should move down so they’re not covering other posts.
Any ideas?
Thanks!

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