You don't actually have a pull request; GitHub just sees that you've pushed a branch, and is offering to create a pull request for it if you want.
If you don't care about that, just ignore it. It's completely harmless and will go away as soon as GitHub doesn't think the branch is "recent".
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…