Logstash and kafka and graylog and order of messages

Hi. We have an application with the event log, our application send event log to Kafka with JSON format. our topic in Kafka has one partition because we need to read order message, also we use Logstash for consuming event log and convert JSON format to GELF format then send to Graylog.
our problem is considering that the topic has a partition, but the consumer(Logstash) does not read the messages in order and our order is disturbed.
we don’t have events in GaryLag in order.
Why the order is messed up. Problems with Kafka or Logstash or Graylog ?

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