It appears something is going on in my Steam library that's somehow making it larger than my HDD's total capacity. I have Solus & Steam installed on my main SSD, and my game files are on a second 1TB hard drive. I have the HDD fstabbed via Gnome Disks so it mounts on boot, otherwise Steam won't recognize my library when I reboot.
Is this a sign that something's going wrong? Is Steam eating files / cache somewhere it shouldn't be or something?