Admin users automatically being reverted back to regular users

Summary

I've changed users from regular users to admin users, and then over the course of the day or by the next day the user is reverted back to a regular user.

Steps to reproduce

Edit user account, select 'admin', then save. Check the account later that day or following day and accounts is once again a regular use.

What is the expected correct behavior?

Users selected as admins should stay that way.

Relevant logs and/or screenshots

So far I haven't found anything matching in the logs.

Results of GitLab environment info

System information System: Proxy: no Current User: git Using RVM: no Ruby Version: 2.3.5p376 Gem Version: 2.6.13 Bundler Version:1.13.7 Rake Version: 12.1.0 Redis Version: 3.2.5 Git Version: 2.13.6 Sidekiq Version:5.0.4 Go Version: unknown

GitLab information Version: 10.1.1-ee Revision: 5da7e033 Directory: /opt/gitlab/embedded/service/gitlab-rails DB Adapter: postgresql DB Version: 9.6.5 URL: https://gitlab.domain.local HTTP Clone URL: https://gitlab.domain.local/some-group/some-project.git SSH Clone URL: git@gitlab.domain.local:some-group/some-project.git Elasticsearch: no Geo: no Using LDAP: yes Using Omniauth: no

GitLab Shell Version: 5.9.3 Repository storage paths:

• default: /var/opt/gitlab/git-data/repositories Hooks: /opt/gitlab/embedded/service/gitlab-shell/hooks Git: /opt/gitlab/embedded/bin/git

Results of GitLab application Check

Expand for output related to the GitLab application check

Output from other sanitize check is all good.