Edit Post window jumbled

When I try to edit an existing post, or add a new post, the window opens crazy. The formatting of the page is all jumbled up. You can edit/add new events fine, just seems to be effecting the post editing/creating window.

For example, the menu bar thats usually on the left, is in the center of the window. And the whole right side of the screen is blank. And everything else that normally appears on the editing page is all all over the place or missing.

The page I need help with: [log in to see the link]