Opens expanded #2

Hello,

I have tried my website (ntnub.no) with different browsers recently and this morning with Internet Explorer 9. All hidden content appeared expanded when the page was loaded, also after reloading a few times. I could click the titles and they would hide.

I haven’t seen this happening with any other browsers than IE 9, but I have seen the problem on two different computers running IE 9.

Do you have any ideas about what could be the problem?

Thanks for your help and a nice plugin for WordPress,
Nils

https://wordpress.org/plugins/jquery-collapse-o-matic/