Logstash and kafka 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
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 use

 stdout{ codec => rubydebug }

in output Logstash config and this Logstash log confirms the issue.
Why the order is messed up. Problems with Kafka or logstash or etc ?
thanks.

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