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When you configure it for 4wire RS485, do you pull the Receiver-Enable for the RS485 tranceivers (your CBUS3) low constantly?
Because if you do then you are enabling the receiver circuit of U4 which will then echo back whatever is sent.
I'm looking at your schematic "sch1proteus.emf" and I cannot for the life of me understand what Q1 is supposed to achieve...
As far as I can see, whenever you push any of the buttons, Q1 will turn on and short out your power supply.
Try removing Q1 and see what result you get.
Is it possible...
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