Constrained image shrinks unexpectedly after hovering a link

Steps to reproduce: hover the mouse over one of the 2 links below

Actual results in IE 8 RC1 build 18372: the image(s) shrink, resize to 32px by 32px

Expected results: the image(s) should not resize

Note: you can unshrink, resize the image by mouse-dragging (text-select) the image from left to right

Link that shrinks both images when hovered Link that shrinks 1st image and unshrinks 2nd image when hovered