Well, there’s a problem, to start with. I don’t know if it’s the problem causing this, but it might be. It seems something is installed on something in the /run directory. Maybe a USB drive? Anyway, that’s not only a bad idea, it shouldn’t be, because there is a chance that mount won’t be the same on a reboot.
So that’s the first thing to correct. If it is a USB drive, and you want to store it on the USB drive, mount it in a more permanent location, for example in /mnt.
After mounting the device permanently, delete the ~/.steam directory.:
rm -r ~/.steam
(This will reset all settings, everything back to default, so you’d have to re-download much you had downloaded.)