„older posts“ link does not move down on manual trigger setting

when i set manual triggering and hit the „older posts“ link, it loads older posts, but the link stays where its at. so when you again scroll down and see the next older posts, you dont find the „even older posts“ link on the very bottom, but between the first and second group of loaded posts. this is awkward somehow…

http://ww.wp.xz.cn/extend/plugins/infinite-scroll/