I have this nagging suspicion that it has something to do with the categories menu loading at the right-hand side. The layout in that part of the page seems to be messed up, too. Inside the window it shows what appears to be another IFrame containing the wordpress application? I’ve uploaded a screenshot here:
This could be a complete red-herring that has nothing to do with the spontaneous reload of the post page, but it seems like both odd behaviors started happening around the same time.