RabbitMQ Input - Duplicate Messages

We have configured an input to read Messages from RabbitMQ via Syslog AMQP Input.
All messages where duplicated in graylog. Whats the reason for?

The guide we used: https://marketplace.graylog.org/addons/246dc332-7da7-4016-b2f9-b00f722a8e79

Update: If we publish a message manually with rabbitmq, this msg isn’t duplicated on graylog…

I guess you dup the messages on ingest.

Check your syslog config.

Thx guys for the hints.
I could find that I have configured the same output twice… There where some missunderstandings also at my side in operating logstash.