"Most Used Languages" shows "q" as a language—what does this mean?

[weightedangelcube]

Hi! I've just set up Most Used Languages with GitHub Actions in my profile repository. I've a question about this "q" language, though—what's it supposed to mean/represent? Is this a bug? Any help is appreciated, thanks in advance!

EDIT: After a bit of digging, "q" seems to represent C#. Most of my C# code is hidden in private repositories—could this be the issue?