Odd. I don't think any of the admins have themselves set to hidden. There's also no option in stock XenForo to do this, though add-ons exist allowing it to be done. However, we're not using any of those.
It still happens: I logged out and got this: I logged in, posted the picture above and got this: So it's definately a bad coded counter.
Oh, it could just be that it caches something somewhere. Might just be core XF code, as we do not have that many add-ons anymore.