Not sure if my html and/or css would be needed to find the issue but I've been calling the bounce effect on images when clicked and it completely changes their position on the screen before/during the bounce. Not sure why this is? I have:
$('img').click(function() {
$(this).effect('bounce', {times:3}, 300);
});
With images to the right of other divs (including inputs) and the jump to the bottom middle of the screen for their bouncing
edit: here is the jsFiddle: http://jsfiddle.net/ep6wG/1/ (images should bounce)