My MQTT broker is unreliable

According to logs, my MQTT broker regularly receives values, but when I listen to the relevant topics, they are only displayed sporadically to me.

The representation of the transmitted values ​​in the mini-graph cards also shows that values ​​are missing.

As I said, according to the logs in the MQTT
Broker is shown the connections and the server transmits the correct values.

Where could the mistake be?