This may be a FireTV app issue, but I guess I'll start here. I use Hulu and Locast, recently I've change the server to use Hulu instead of Locast for ABC/NBC/CBS so I changed the priority of each service so Hulu is above Locast, and I hid the ABC/NBC/CBS Locast channels. The problem is the channels still appear in the Locast section but without guide data. The curious thing about it, is the web guide doesn't show them. ABC/NBC/CBS do show properly in the Hulu section of the guide with proper guide data. I've got a couple of screenshots.
Try restarting the FireTV app?
Or maybe go into settings and import favs/hidden for the tuner that's out of sync?
Ack your right, I forgot to sync favorites. Can't believe I forgot about that.....