When you load that URL, you'll see it actually changes URL, though this isn't the case in XF 1.4.4 (not released yet) and XFMG 1.0.1.
However, I don't think that was actually relevant in this case -- if you go back to your original post, you'll see that it's appearing now and it doesn't look like the image URL actually changed. That likely just means that we couldn't contact your server at first or there was a permission issue that was later resolved.