Problem with sending message from Chirpstack and MQTT Explorer

Hello, everybody!

encountered some problem.
the system has several end devices about 300
now there are about 20.
Data from devices is coming, but it is not possible to send a command like AT+…
in response come txack and ack

if 2-3 end devices are working, then the commands are sent.
in frame receives ConfirmedDataUp and Unconfirmed

I suspect that the case is in the configuration files, but the problem cannot be solved

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