MQTT devices disappear

Hi,
I got two zigbee2mqtt servers, the plugin in HA and a external server in my LAN with several sensores.
All sensors are recognised by zigbee2mqtt.
If I register a device in zigbee2mqtt it shows up in HA (mosquitto) but then disappears. It’s not possible to see two or more devices in mosquitto mqtt they all disappear at least after rebooting HA.
???
please help me.

bobb16.

Did you ensure that you’re using different topics for the different Z2M installs, as explained in the FAQ?

Thank you! That’s it.
Greetings, bobb16.