Problems with sidebars – some are in left/right other in footer

Hi,
I used this theme on http://weloveprettylittleliars.net/ a month ago.
Today i wanted to put it online again but when i tried to add Widgets there was a problem. So, First five widgets are in left/right side but when i put sixth it goes in the footer after content.
How to solve this problem ?
Thank you! 🙂