I had a similar problem earlier with column alignment. This problem was fixed by adjusting the right column to float right and making minor padding adjustments. Now it seems the headers are thrown off just enough to increase the width of my columns, which recreates the column padding issue. As there are different headers in the right column for different pages, I did not notice this right away. As per usual, FF is working like a charm.
Ideally, all of the headers, text, content would be aligned left (and even across the top). Is there default padding in IE for each header tag and can I overwrite this?