This sounds like it's on some cable box to the antenna input and the TV is on channel 3. That's the now over 10 year ago setup and could be problematic.
Any chance of updating the setup?
Hi my mother n father have a Samsung smart tv and what ever channel their watching it shows on info it's on channel 3 Wether it be on 1 or 38 it says it's on 3 even if you put subtitles on its subtitles for channel 3 what ever channel your watching oh and when you press guide it shows its on channel 3 I tried a factory reset but solve it .

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