The SD and HD versions of the locals will both appear in the guide as the same channel (i.e. 4). The HD version is the one with the call letters (i.e. WDIV). Are you sure you were recording the HD version.
To eliminate this confusion, hit menu - Parental,Fav's&Setup - System Setup - Display. Once there, from the preferences tab, where it says Guide HD Channels, select Hide SD duplicates from the drop down.
To eliminate this confusion, hit menu - Parental,Fav's&Setup - System Setup - Display. Once there, from the preferences tab, where it says Guide HD Channels, select Hide SD duplicates from the drop down.