[cflsystems]

They are not the same height. On this example page first 2 product containers have height of

height: 313.367px;

while the rest have height of

height: 294.367px;

This difference of the height causes the 4th product to go under the 3rd one since product containers float to the left. You may think all the info is the same but if you look at the source code you will see the different styling and the info is not the same - the first 2 products have their title to spread on 2 lines causing the container to have bigger height...