Migrating from Github.com to Gitlab.com - with issues, commits

In going from GitHub.com to Gitlab.com - commit history was intact and author info was intact :+1:

However, issues was different - it defaulted to my username as author and stated in each issue "Created by "
I know this happens if the user is not a gitlab user but all our users moved over to gitlab and I made sure that they set their emails from GitHub the primary in Gitlab.

Is there a way to troubleshoot this and see where it may have gone wrong? Is it a known bug? Has anyone had success with this? Thanks.