possibilities where the chirpstack send the acknowledgement to the device

What is the possibilities where the chirpstack send the acknowledgement to the device for the uplink, device also received it. But chirpstack doesn’t show it in the event log. What would be the reason?

If you look at the “LoRaWAN frames” tab instead of the “Device events” tab you should be able to see them.

Yes, but i cant see the Fcnt in events tab