Website looks bad in IE

Hi guys.

I know this is a commonly asked question, and I’ve read through several other threads without luck. On three individual machines the website looks like a massacre in IE, but alright in Firefox and Chrome. In IE the entire body of the page is pushed to the left instead of being in the middle, and the sidebar goes down to the bottom of the page.

When I enter a post in IE it looks OK, and it’s only on the homepage and sub-pages it goes wrong.

For instance:

https://www.consciousobserver.net/electrical-buzzing-in-the-head/ looks OK in IE.

https://www.consciousobserver.net

or

https://www.consciousobserver.net/category/articles/consciousness/

does not look OK.

If I were to browse through the source-code I wouldn’t be able to spot the error, if that is where I should look in the first place. Any help on this is tremendously appreciated!