only thing i could think of is that somehow you have 3 cells in the row that contains the main content, because the "Site Map" link is also not on the far side, and where the yellow stops is exactly where the calendar column begins, which points strongly towards a third column there (which the colspan="2" isn't handling)
you could try just changing the colspan="2" to colspan="3"
--edit--
heh, we both managed to post at the same time
