Cannot make new administrators or revoke admin rights for existing ones

On our Account -> General page I am unable to add new administrators using the user search box provided. I can find and select users from our team using the search box, but clicking them has no effect. Similarly, clicking the ‘Revoke’ button next to existing administrators prompts me with a confirmation box, but clicking ‘OK’ has no effect. I believe we recently added myself as an administrator, but this is not reflected in the admin list.

Hi @adm78 can you link me to your repository settings page? I believe we tie our permissions to GitHub/Bitbucket/GitLab owner permissions.