I figured out my issue though after a bit of troubleshooting.
So, I use Syncthing to sync my files between my Deck and PC. I also use Google Drive on my PC to sync these same files to the cloud. It turns out, Google Drive CHANGES FILE PERMISSIONS, which were in turn syncing to my Deck. I simply turned on “Ignore Permissions” in Syncthing, reset all my permissions on my folders on the Deck, and everything’s working fine now.
Really annoying how Drive changes file permissions. But at least I figured that out.