Hmm, I hope I understand your problem correctly.
You have two broody hens, in two separate coops, and neither of them can ever find their nest of eggs, right?
Do you gather all the fresh eggs that are laid so your broodies don't get confused and sit on the wrong pile? If there is only one nest with eggs, the one your broody should be on, then that is kinda strange that they can't find their way back to it.
What level are the nests on? We have bottom nests (Same height as the floor), middle nests, and top nests. Middle are definitely the favorite, and only 1 or 2 top nests are normally used. I generally have my broodies as far away from the popular laying boxes as possible, but if I have a broody in a top nest then I have to put her back on her nest everyday.
When the broodies get off their nests, do you find them on a random nest each time or is it just one nest that they go to?
If all the nests are on the same level, and there is only one nest with eggs, and they always sit on a random nest after getting off the correct nest, then I'd say your hens just have a bad memory. (Sorry, lol, but I can't think of anything else)
I hope you figure it out