wiki embed ruins page structure

Hi.
I am using the Twentyeleven theme with WelcomeWiki for integrating a bussiness wiki with wordpress. lately I have noticed (maybe result of recent update?) that pages with embeded wiki pages have a strange behavior: the footer comes after the main content section closing in a way that riuns the whole footer area, thus completely scrambling archive pages. I have also noticed that there is some problem with content coming after embeding (it is not displayed). I tryed to dive into the code but I could’nt find the reason for such strange behaviur.
a link to such page can be seen here: link

https://wordpress.org/plugins/welcomewiki-lite/