data send from one node to other node more than one time while doing rfm69 communication

[abt]

When ever i am sending data using serial port from one to another. Data gets printed on serial port 2 to 3 times. I am using arduino uno. I am referring https://learn.sparkfun.com/tutorials/rfm69hcw-hookup-guide/all#res code.Here for Node 1 same code and for Npde 2 just swap value of MYNODEID and TONODEID.Here i am using 868MHz that i have already changed in my code.