I noticed this a while back with a private project of mine. The Github languages breakdown seems broken. Mine is a Python project with a handful of Jupyter notebooks but many many python files. The LOC must be 80% python files but Github sees the project as 50% Jupyter.

You can tweak/exclude with .gitattributes

https://github.com/github-linguist/linguist/blob/master/docs...

I had no idea. Thanks for sharing.