Note how, when you use the arrows on either side of the "Jump to" select field,
http://www.learnandteachonline.com/moodledev/mod/resource/view.php?id=3
the field and the arrows hops around a little, horizontally.
Unlike in 1.4
http://nsc.learnandteachonline.com/mod/resource/view.php?id=4
where the arrows stay put, letting the user keep her mouse in the same spot on the screen to buzz through the pages.
The shift seems to happen with a change in resource type.