When textbox is resized in IE, block position behavior is messed up

i am using the autoresize plugin which increases the height as users type开发者_如何学编程 in stuff. It works great on FF/Chrome, but the behavior is messed up on IE (see screenshots below).

Essentially, the textbox, when resized, does not push the rest of the buttons down, which is weird, given that nothing on the page is absolute positioned.

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I suspect the button and span on the right are in a relatively positioned container? I've encountered the same problem recently with positioned elements and expanding/collapsing siblings. Still searching for a proper solution, but removing the positioning can be a temp fix.