If it's checking analog & then digital, it's likely checking both
ATSC (Over The Air TV received w/ antenna) and QAM (cableco supplied digital channels). If it finds any QAM channels, they are often (but not always) in the higher numbers, like 112-n. They are rarely logically numbered, and they occasionally change channel numbers, requiring a periodic rescan/rehunt for channels. This is probably as a ploy to make you rent their boxes, which unlike the tuner in your TV, will keep the same channel numbers all the time.
If a complete channel scan turns up no digital channel numbers, either your TV doesn't have a QAM cable tuner or your cableco is scrambling all digital channels.