xbee s2 two way api communication

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I have total 4 nodes (1 coordinator, 3 end devices). Each node has an arduino uno and xbee. I have already configured all the xbee’s in API mode.
The two way communication from coordinator to a single end device is working fine. But, when I add the other nodes in the network, the communication is messed up. I am not sure what the problem could be.

What do you mean by “Messed up?” Can you be more specific?

Can you tell me how you did two way communication between 2 Xbees in API mode?