You can see, both on the "shared by" modal and on the "# shared" subtitle (to the bottom-most post), that one person shared the post. The hubwheel(?) counter says two people did.
At the same time, it correctly displays my other post (next to bottom-most) being shared by one person, on the subtitle and the hubwheel(?). No other post, mine or someone else's on my front page, displays erratic behavior.
EDITed title because, apparently, <angle quotes> aren't allowed there.