Columns content only shows one column

Hello,

I need help 🙁
I have my columns set at 3 columns per row, so I am suppose see 3 columns and three row. However, it randomly shows all my pictures in one column, sometime it works fine, some times it does not. The website is http://www.smartfirsthomebuyer.com can you guys take a look a it? mybe somebody with more experience can identify the problem easily; I am really need at this.
Thanks in advance