Comment 8 for bug 1778225

Unfortunately I can't make sense of the information you have provided so far. The locale configuration is screwed up somehow, but none of the two files where such configuration is normally saved seems to be involved. You reported that "Apply System-Wide" makes a difference, and that precludes quite a few candidate files.

I don't know how to reproduce the behavior you describe, and so far I see no confirmed bug in any of the packages which are involved in language/locale settings. Can you add anything else to shed some light on it?

Possibly you simply need help with cleaning up the configuration of your system, and then some support forum such as <https://askubuntu.com> is the place to go.