Is the roost you want them to go to the highest thing they can roost on? They will usually instinctively roost as high as they can. They are creatures of habit though and may resist a change. I'd suggest giving them a couple of nights to make the change on their own. If they don't, then after they are asleep, move them to the roosts with as little light and commotion as you can manage. They should catch on pretty quickly.
How old are they? It sounds like they are probably fairly old, but mine don't usually start to roost until they are 9 to 11 weeks old. My current brood play on the roosts during the day and I have seen all of them on the roosts at the same time, but they still sleep on the floor. They are almost 9 weeks old, so I expect them to start roosting at night pretty soon, but they are not mature enough yet.
If your 1x2 horizontals are arranged so the thin side is what they are roosting on, it may be a bit thin. It would be better if the wider side of those were what they are roosting on. A lot of people believe that chickens need very wide flat things to roost on. There may be some advantages in very cold climates for the roosts to be wider so the feathers cover the feet better and help prevent frostbite but I'm not entirely convinced of that. I have tree branches as roosts, about three inches thick at one end and about 1-1/2" thick at the other. One group roosts at the thick end while another group roosts at the thin end. And when they are snuggled in for the night with their toes wrapped around the roost, their feet are all covered by their feathers. You can get too thin, and a finished 1x2 is probably only 3/4" thick, so I would suggest having the flat side up and I recommend rounding the corners. Sanding that sharp edge off does make it more comfortable as they wrap their claws around it and I think it helps prevent splinters which could lead to bumblefoot.
Good luck! As long as they are not putting droppings while roosting where you don't want them too, this is probably one of the things to not get too stressed out about.