[Podman] Overriding run root "/tmp/containers-user-1253/containers" with "/home/myuser/rundir/containers" from database

I set "export XDG_RUNTIME_DIR=", so it will use /tmp/containers-user-1253/containers. But sometimes it'll use /home/myuser/rundir/containers. In debug log, there is "Overriding run root "/tmp/containers-user-1253/containers" with "/home/myuser/rundir/containers" from database". Why is this happened. time="2023-02-14T16:05:51+08:00" level=debug msg="Initializing boltdb state at /tmp/1253/share/containers/storage/libpod/bolt_state.db" time="2023-02-14T16:05:51+08:00" level=debug msg="Using conmon from $PATH: "/home/myuser/.local/container/bin/conmon"" time="2023-02-14T16:05:51+08:00" level=debug msg="Initializing boltdb state at /tmp/1253/share/containers/storage/libpod/bolt_state.db" time="2023-02-14T16:05:51+08:00" level=debug msg="Overriding run root "/tmp/containers-user-1253/containers" with "/home/myuser/rundir/containers" from database" time="2023-02-14T16:05:51+08:00" level=debug msg="Using graph driver overlay" time="2023-02-14T16:05:51+08:00" level=debug msg="Using graph root /tmp/1253/share/containers/storage" time="2023-02-14T16:05:51+08:00" level=debug msg="Using run root /home/myuser/rundir/containers" time="2023-02-14T16:05:51+08:00" level=debug msg="Using static dir /tmp/1253/share/containers/storage/libpod" time="2023-02-14T16:05:51+08:00" level=debug msg="Using tmp dir /tmp/podman-run-1253/libpod/tmp" time="2023-02-14T16:05:51+08:00" level=debug msg="Using volume path /tmp/1253/share/containers/storage/volumes" time="2023-02-14T16:05:51+08:00" level=info msg="podman filtering at log level trace"