Strange behaviour of Git: mysterious changes cannot be undone

Question

I am seeing a behaviour in Git which seems very mysterious to me. I keep a clone of the Linux repository from Github to play with Git locally. To be clear, I don\'t do much

Answer 1

Try updating submodules. I've gotten some weird, somewhat similar issues when a submodule included in a repository has been updated. Doing git submodule update may do the trick.