Sidebars Pushing to Bottom of Page

We are having an issue with our site with our sidebar using Catch Kathmandu Pro. We have selected Right Sidebar as the layout. On a tablet, the sidebar shows up next to the main content in landscape mode, but goes to the bottom of the page in portrait mode (which we expected). However, that same page viewed on a computer screen pushes the sidebar to the bottom of the page. The main content is pushed to the left with a big white space on the right, the sidebar is pushed to the right with a huge white space to the left. This is happening on all the pages. Basically it looks like the sidebar is too wide and won't fit in the space. You can see that it and the main content overlap by about an inch or so. http://www.cerguua.org/HUULTI However, if you drag the screen of the browser to make it smaller, eventually the sidebar will pop up where it is supposed to be to the right of the content. Switching to a left sidebar does the same thing. We have made no customizations to the css. Thanks, Beth