It’s weird for me. I also check your site on my side and i still get 3 columns on that row by checking on browser developer tools. Here are the captured images :
1. https://www.dropbox.com/s/5371qjo2zqbolzg/Screenshot%202017-12-21%2009.49.21.png?dl=0 (the current result)
2. https://www.dropbox.com/s/678fim0bmkeuyay/Screenshot%202017-12-21%2009.49.44.png?dl=0 (what is supposed to be)
Can you help me to provide the content of that page so i can replicate it on my side? or if you willing to provide me login into wp admin panel of your site you can send it here and don’t forget to check Set as private reply option below.