Pages change size when reloading

Please check my website http://www.profileaf.co.za. Its hard to explain but my pages changes size when I reload the page. (Reload it a few times) I think it has something to do with the sidebars that I wanted to remove and now there is a glitch.

I don’t want sidebars on the home page and contact us page, but on the rest of the pages the sidebars must stay.

I would be very thankful for any advice and suggestions