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The digital versions of your stations may all have been UHF prior to the shutdown of analog broadcasting. Stations at that time either switched the DTV operations to the former analog channel, kept using the same digital channel, or moved digital broadcasting to a completely different channel.
Think about it. The FCC overlaid a parallel digital TV service over the existing analog service without causing much interference to analog while doing a decent job of replicating reception ranges. Many compromises were made to make the parallel service work that were no longer necessary once analog broadcasting stopped, so stations could try to maximize their service areas.
This was all supposed to be transparent to folks who already had antennas, thanks to part of the data that's encoded with the video as part of the ATSC standard for digital TV. That data is the "virtual channel," so a station's parallel digital service could be known by the same channel number as the analog broadcast (e.g., a digital broadcast on channel 48 encoded to identify as "4"). When analog shutoff happened, whatever the station did, you should have had the antenna for, so a re-scan of channels would have restored reception and you could see channel "4" again.
This, of course, breaks down for people who never had an antenna. The solution is to pay attention to the real channels listed in your report.
BTW, this is all explained in the FAQ that's linked near the top right corner of your report.
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