Missing Channels on Apple TV but show on Web Guide and iPhone and iPad

I am missing channels on Apple TV, that are viewing on my iPad, iPhone and Web Browser. For example, I can watch MSNBC on 603 or 6050. But 6050 (along with others) doesn't show up on the Apple TV guide? There are random set of channels. Sometimes I watch TV on the higher channels for TV Everywhere not to take up a tuner. However, other channels show up two or three times Cable, TV Everywhere and Locast. I'd like to have the option of seeing all available even if they are duplicates.