System user shifting

I have noticed that some of the system user is “shifting” from time to time. I have enabled navidrome service and have /var/lib/navidrome preserved by preservation with user and group both set to navidrome. From time to time, the /var/lib/navidrome directory and some of its subdirectories and files and have their user changed to something else and that leads to navidrome service to fail. Since both the parent directory and some of the subdirectories get affected, I assume it is not the problem f...