Where are you located? You are probably talking about a broadcast network (H&I, MeTV, etc...) that is carried by a location station that recently made changes. There are many posts about this in the Seattle area and elsewhere. Comcast simply passes on what the station broadcasts and has no control over what networks they carry. It can sometimes take a few days for the guide data to be updated since Comcast gets their info from Gracenote, and the station has to update the info they send to Gracenote.
The two networks are probably on subchannels from the TV station. They probably swapped subchannels, which is why they are reversed on Comcast. Comcast just passes on what each subchannel has and it may take awhile for ID codes assigned to each channel to get updated so they match.