I posted this topic about weird thumbnail caching last week because MSNBC always displayed an Iron Chef thumbnail on my iPad. Today I discovered the reason why that is happening, and it appears to be a bug.
My HDHR Prime/Frontier Fios has MSNBC on channel 603:
But Pluto has Iron Chef mapped on 603 as well:
The resulting offspring is an abomination with the MSNBC logo but the Iron Chef thumbnail and name: