Not counting national HD, locals are usually mapped down to the below the 100 channel range to make it easier to find as most people know their local channel number, the same goes for their HD version as well. The National HD channels are found in the 94xx-95xx channel range and are mapped down to the location of the sd channel, this gives the viewer the choice of which version they want to watch and also lets them know when new HD channels are added. If you do not want this, you can go into the Local Channel screen and either change or remove them from the mapped down area. You can set up favorites guides to skip them in the guide. Or you can use Locks to take them out entirely, guide and search features.