Behaviour of C-; and C-. in emacs 27.2

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I must be tripping but you mentioned "C-." but in your config you have "C-' ", is this your problem?

No, I'm sorry I'll probably edit the question since it is ambiguous: "C-' " works perfectly fine, while "C-;" and "C-." have both the same weird behaviour described above

Are you on Linux? https://askubuntu.com/questions/1370022/ubuntu-21-10-keyboard-shortcut-ctrl-changed-how-to-disable-or-change

Yes! That's it! Thanks a lot! I'll probably delete the post in an hour or two since it is not emacs-related...