Forking process stuck

I'm trying to create a fork of _s_cadwallader/CodeMaid_, and forked at a specific branch (default) instead of tip, since I only want to make changes in this branch.

There is a new fork notification on my dashboard, but when I visit my fork I get the following message:

Cloning Repository

Please wait a moment while we clone your repository.

It's been showing this page for over 3 hours already, so I'm assuming the process broke somewhere.