Some -small avatars seem to be missing from s3 and do not show in the overview (BB-2335)

There are no avatars on my repository overview page https://bitbucket.org/ojo/gnome-shell-extension-netmonitor\\
The username is linked correctly to the profile but there's just no avatar.
On the other hand the avatar is shown in all other places for example in "Repositories" drop-down menu.

I've attached a screenshot to show the problem.