Using a child-theme of twenty-thirteen.
For this bug to appear you must load the page in "skinny mode" first.
On a desktop machine when you load the page in "skinny mode" around 700px width and then widen the screen to something like 1280px...
After it's been widened the instagram photos go from;
being under the blog content and square
being in the sidebar and appear in "tall rectangles".
I'm not able to update the WP to 3.8.1 at this time because of server "issues".
I'm not sure if this is something that my CSS is causing or if this is reproducible on another site?