Only one WP-Avatar doesn't shoe

I uploaded several avatars for different user profiles, most of which work just fine. However, there is one image, that doesn’t display. Format is the same as the others (png), size is the same. It is the one associated with my own profile. The otheres appear besides comments, mine doesn’t. Any ideas?
Thanks a lot in advance…

https://www.ads-software.com/plugins/wp-user-avatar/