Ahhhhh yes. Weeing on beds.
I've got a queen in our conservatory nursing her kittens. Whenever she comes out of her pen (if we don't catch her in time), she emptys her bladder all over one of the kitchen units. If we're really unlucky she crimps one off over there too.
Not a great thing to have happen on food preparation surfacese!
As was mentioned above, if they're entire weeing/spraying is going to be more likely to happen.
What combination of cats do you have? It sounds like there's some territorial competition there. If you don't keep the doors shut between rooms to give them their own space you may have to start doing that. Will be easier to understand the problem if we know whether they've been 'done' or not.. what sex they are, and whether anything's changed recently.