FCC regulations state that when there is a local full power broadcast station within a market … then that broadcaster has the right to enforce two FCCs rules: 1) network non-duplication and 2) syndicated exclusivity rules…
These FCC rules require that cable operators can not carry duplicate stations and that the cable operator must blackout any and all duplicated programming if it exists, on other stations.
So, it must mean some other channel is carrying the exact same programming, or something similar to that situation.