Lora gateway is not receiving data from nodes continuosly


im working on lora from 1 months=, i set up lora gateway and i sent signals from node to gateway with 10sec time gap, at the beginning the gateway has received all the transmitted signals perfectly with the timeperiod of 10 sec. But now its not receiving the signals as before, my node is sending signal for every 10 seconds but my gateway is not receiving it like before, instead it receiving 1 message for 10 transmitted signals(like if it takes 20th transmitted signal then its again receiving it at 30,40 and so on) the time gap for this reception is 100s (10*10=100). can anyone know where did i went wrong or is it im avoiding any ground rules something ???