Yeah, I had a similar issue happen to me once back in 2006. I was watching my Mount Holly IntelliStar, then suddenly the feed switched and I saw the Camden IntelliStar instead.
...and the same thing happened this afternoon, except I got IntelliStar 21865, from Burlington's headend. I first thought there might of been a headend merge, but after further looking at this IntelliStar's config, that couldn't of been the case because it didn't have any cities nearby here, and Marlton could barely been seen on the metro map. The current conditions were from Burlington and the forecast was for Willingboro/Mt. Holly/Roebling. 21872 returned within a few hours later though, so there was probably some difficulties or something.