After more browsing in IE I have uncovered more weirdness.
Open the following links in IE. Kudos to you if you can explain it!
So the main page doesn't show the sidebar like it's supposed to be ( http://www.postmasculine.com - the tabs are completely missing below the social buttons.)
Then, many individual posts show it exactly how it's supposed to be: the sidbar shows in the sidebar with Best Of, Recent (Posts), and Comments. Example: http://postmasculine.com/a-new-masculinity
Some posts show the layout of the tabs, but with only "Best Of", while Recent Posts and Recent Comments are shown elsedwhere, in the bottom of the sidebar. http://postmasculine.com/the-long-term-travel-guide
Some posts show the sidebar how it was before, with Best Of Postmasculine and the recent posts and comments all showing separately in the sidebar. Example: http://postmasculine.com/butchering-the-alpha-male
Somebody please explain this weirdness!