Yes, they will all look the same. I don't know if another admin has been working in that area but for some reason part of the layout doesn't appear to be getting loaded, or is loading the wrong styles.
It appears that this problem doesn't occur in Firefox, does in Chrome and Opera.
I've looked at the code and can't see anything obvious that would cause this. One path I tried was looking for a missing semicolon that Firefox is more robust about handling than the others but no luck.
Have you changed browser recently? Can you state with certainty that it has worked in your current browser at some point and doesn't now? (Not sure how this helps, just looking for any and all info I can get ATM).
Current Favorite Quote: "People love a happy ending. So every episode, I will explain once again that I don't like people. And then Mal will shoot someone. Someone we like. And their puppy." - Joss Whedon