Kibana console 's message section show messy code only for elasticsearch server's messages, but ok for other servers forwarding messages by filebeat

Here I setup kibana/elasticsearch/filebeat in one server: autoyast1, and it also plays as syslog server by store all forwarding messages from managed servers. Today I found ONLY the server itself's message shows as messy code in kibana console's "message" section as attachment shows. Other forwarded messages from other servers looks ok.

What's the reason and how to fix?

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