plex not mapping channels?

I have a block of about 12 channels that arent being mapped (work on sd dvr). When im under the channel setting its will have a blank check box, then the channel id (236 ESCAP__WYOU_ESC) but under the drop down it says select channel and I dont have any free channels. Am I missing something or is this an epg issue… i mean i dont know what else to do to get them… (i should note that ALL the channels are ones that would be like channel 10.2, and all fta channels)