@ethanxrosen No worries 🙂 I hit the same problem a few months ago (however, I ended up basically never using CouchPotato to download stuff directly, instead basically only using it for post-processing, as it's not that good at it, and it's much less useful for movies than for TV shows)
This caveat shoud however be noted in the CouchPotato documentation https://docs.cloudron.io/apps/couchpotato/ . @girish maybe you can add a line there that says that to use CouchPotato with Transmission, one has to use Black-hole?