I apologize for the inconvenience caused by my own lack of awareness. I didn't check the settings and information I had configured myself, and I arbitrarily decided that the cause was unknown, which led to a misunderstanding. Regarding the subject of your consultation today, the cause was not unknown; it was actually an "add-on that I installed and configured myself." It occurred because of my own mistake in checking. I apologize for making such a fuss about the cause being unknown. I am very sorry for the inconvenience caused to everyone. The problem has been resolved successfully, so I apologize.

Thank you for reporting back. Is it a common add-on? You could mention its name in a reply in case someone else searches out the solution for the same problem.

No problem at all, glad to hear it is resolved.