Is it normal to send the unconfirmed message once and receive twice?

Is this caused by a problem with the device or gateway, and if so, how to set it to avoid this phenomenon?

INFO: Received pkt from mote: 26041304 (fcnt = 12)

INFO: Received pkt from mote: 26041304 (fcnt = 12)

JSON up: {"rxpk":[{"jver":1,"tmst":50978645,"chan":5,"rfch":1,"freq":487.300000,"mid": 8,"stat":1,"modu":"LORA","datr":"SF7BW125","codr":"4/5","rssis":-10,"lsnr":13.5,"foff":-269,"rssi":-10,"size":18,"data":"QAQTBCaAAAACMkUdJTzaCu1f"},
         {"rxpk":[{"jver":1,"tmst":50978646,"chan":0,"rfch":0,"freq":486.300000,"mid": 12,"stat":1,"modu":"LORA","datr":"SF7BW125","codr":"4/5","rssis":-74,"lsnr":-4,"foff":-257,"rssi":-70,"size":18,"data":"QAQTBCaAAAACMkUdJTzaCu1f"}]}

It is very likely that your device is too close to your gateway, in which case an uplink might be received twice by the gateway. Make sure that the device and gateway are a few meters apart.

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I got the same answer from others.

Is it true that when the distance is normal, theoretically only one packet can be received at a time of transmission, without exception?