It’s looking fine in FF, but it is shifted in IE.
Try this…find your right sidebar styling in your style.css and change the width value from 200px to 155px and see if that corrects it. If you want that sidebar wider, then you will need to look at your other sizes in the container and possibly the left sidebar. I tried adjusting down the size of the container from 520px, but that has no effect…evidently that is being overrided somewhere.