inconsequent behaviour of div's

[elpuchy]

I have a site running WordPress. The design of the homepage looks right half of the time and wrong the other half. The fact that it doesn't always makes it hard for me to understand what is happening and solve the issue. I can reproduce the issue by refreshing the specific page in chrome and IE, I did not check other browsers.The page I am talking about is here:http://boat-hotel.com/index.php/nl/Below the main image there should be 3 columns of text. Attached you find a screenshot of the page that doesn't show right. screenshot of error occuring