ES will be going offline this Monday approximately for about 4 hours from 6am to 10am as we update the board software.
I'm betting there's embedded tweets or other media in those threads.
When the page initially loads, the Tweet is loaded inside an iframe and sometimes that iframe has to be expanded once the loading is finished. This may result in the screen extending slightly, however there is not much we can do about this presently unfortunately. We are, however, looking into alternative ways to embed Twitter and Facebook content in a future release that may alleviate this concern.