Why are all my PR descriptions co-authored by me, when no one else has contributed to the code?

When I go to squash & merge a PR through the GitHub web interface, the PR description is always autofilled as “Co-authored by <my full name>.” There aren’t any other contributors listed (and no one but me, on my local machine, contributed any commits). How can I make this stop happening? I don’t recall changing any settings that would have turned this on, and none of my coworkers are experiencing the same behavior. 

Hey @clottman, I believe this was changed in conjunction with some of the other squash merge changes that took place recently. There is not currently a way to revert this behavior. I suggest leaving feedback on your experience here: https://support.github.com/contact/feedback and have your team do so as well.