Very old events are published in Elastic Search

When I checked logs kibana today, log events at 4/12 is being published now.
For example,
|@timestamp| |April 25th 2019, 11:15:15.213|
| offset |1,395,503,642
|raw_message| |####<2019/04/12 17:39:25.555 +0200> <fr2prd_a> <2289>

My company is using log rotator and we change file name everyday.
My company's ELK stack is
filebeat --> Logstash --> Elastic Search.

Do you have any idea why this is happening?

Thanks advanced for your help.

Do you mean December?

So 13 days old events. Have you checked the time on all nodes involved?

This is April not December.

I checked the time in all nodes and nodes are okay.
It seems like old events and recent events were published at the same time.
Can you tell me when this can happen?

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