Front page column width

My web site (G2KU.com) started off with two columns but now it only has one. Everything has shifted into the left hand column and runs in a long vertical line. I've checked Page Builder and the page width is 902px. Column #1 is set at 60% and #2 at 40%. I'm pretty sure that's how it has always been so I don't understand what has changed and I can't figure out how to change it back to two columns.

I got today the same problem after post a new news message, after deleting the message is was normal. 
I don't know why this is happening, maby a to long header...  

have you done something done on your site, and this made a conflict with some others?
You never know.

Thank you so much, that's all it was - the heading in a news item was too long. Gee whizz, they need to take a look at that. It wasn't that long, all it said was "G2KU launched on Obama Day!"