The top-page dropdown list successfully sets the "page" query parameter of the "pager" component for the result display function.
The bottom-page dropdown list triggers a reload of the page but with the same "page" query parameter as before.
All navigation buttons ("previous", "next" etc) work as expected, it's just the bottom-page dropdown list that's behaving strangely.
Tested with both MSIE 9 and Firefox 4. The effect is particularly weird as the code for the drop-down menu appears to be the same at both positions within the HTML page (and was most likely generated by the same routine).