(It's kinda weird, because to make a PR, I had to make a fork, and then I added the licence to my fork, even though I'm not allowed to pick the licence, but )
They went with a more open license. Try to do better next time with your license choices. GNU is not nearly as open as the "DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE."
Just FWI, it's not illegal to add an incorrect license to a repository you don't have the rights to. It's simply a lie. The copyright notice is just a statement from the author, it doesn't per se define the terms under which the project is distributed. What defines them is the fact that it's the author who put the file there.