A DVD recorder contains a TV tuner, and you can record onto DVD direct from that, or you can plug a scart cable in the back and record from the output from Sky, Freeview etc.
If you are recording from Sky then you need to set the DVD recorder channel to EXT1 or AV1 (will vary depending on your DVD model). This will record whatever is coming IN form the Scart lead.
It sounds as though you MAY have the TV tuner in the DVD recorder set on channel 2 and you are recording that channel.
What are you actually trying to record from - Sky or Cable box, Freeview box, TV tuner in the DVD recorder or what ?