my picture/icon/gravatar/avatar-thing on this page is a random design and not the image I uploaded. Did I do something wrong?
Not at all. This is likely due to the rating of your Gravatar, as some blogs can choose the maximum rating they're willing to be displayed in Settings -> Discussion. In regards to this forum, we only display G rated Gravatars.
You can update your Gravatar rating here by hovering over the Gravatar, then clicking the rating icon that appears to the right of it:
https://en.gravatar.com/emails/
Let me know how that works for you.