I'm sorry that I don't have anything more specific, the branches just don't show on the pull requests list. pr-branches is showing in the console but none of the PRs have info about their head branch below them and there's 20 PRs on that page and all of them are mine.

URL: https://github.com/Cog-Creators/Red-DiscordBot/pulls?q=is%3Apr+sort%3Aupdated-desc+author%3Ajack1142+is%3Aopen
Screenshot:

Maybe this will help a little - on refined-github's closed PRs list, the branch is showing for PRs made from the sindresorhus/refined-github repo, but it doesn't show for my PRs (made from the fork):