If you have one of those multi scart adaptors with more than one thing plugged in at once, then that can cause ghosting. if your scart things are all plugged into separate sockets, then try unplugging each thing separately and see if that makes any difference.
If you have a normal TV aerial cable plugged in and you're receiving a TV signal through a cable or sky box try unplugging that as well.
Test everything like that individually and if you can test them on another TV as well. That will rule out or confirm a problem with a single piece of equipment or the TV. If it's the TV, then take it back to where you got it from, or at least ring/visit them first to save unplugging it and carting it back there unnecessarily.