MQTT explorer seems to corrupt data in broker

[RobertvO72]

Hi,
I have a modbus kWh meter. A Raspberry Pi collects it's data and sent it to a online broker (HiveMQ). That broker is bridget with my HA broker.
Every now and then I get a strange value of the energy, corrupting my energy dashboard in home assistant. I have to remove the strange value from my statistics.
First I thougt this value came from the raspberry pi but then I start logging both MQTT brokers with the MQTT explorer..
At that point, I noticed a very peculiar thing. When I closed the MQTT explorer logging the HA mqtt broker, and started it again, I got a corrupt data point in the broker and also in Home Assistant.

The upper part is HA mqtt. the lower is bridget HiveMQ. It is visible the first datapoint, at 10:18:04 is 924,4.
The following datapoint are 293,xxx.
How is this posible?
I am able to reproduce, every time I start mqtt explorer on this broker, this happens.