Avatar link broken

I linked an image to my GitLab account with Gravatar but it was only representing in the little image in the top right of the dashboard, not the main picture in my profile. I uploaded the same image stored in my local file system and now all the images have the broken link icon.

I have deleted and reapplied the email address and avatar in Gravatar, then cleared the cache in the (Chrome) browser to see if that helped, but the links are still showing broken.

Any help with this?