ERROR chirpstack::uplink: Deduplication error error=No channel found

ChirpStack (v4)
1

I have this below and i dont understand the pb ? root@chirpstack:~# journalctl -u chirpstack -n 200 | grep -Ei “join|error|mic”
Aug 23 17:22:30 chirpstack chirpstack[21044]: 2025-08-23T15:22:30.581470Z ERROR chirpstack::uplink: Deduplication error error=No channel found for frequency: 867500000, dr: 0
Aug 23 17:22:59 chirpstack chirpstack[21044]: 2025-08-23T15:22:59.645180Z ERROR chirpstack::uplink: Deduplication error error=No channel found for frequency: 867700000, dr: 0
Aug 23 17:23:10 chirpstack chirpstack[21044]: 2025-08-23T15:23:10.661735Z ERROR chirpstack::uplink: Deduplication error error=No channel found for frequency: 867300000, dr: 0

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