Error in reading data

I am using Logstash 5.3. and connecting to Oracle database.I gave a select query with values for 1 year.It worked fine but suddenly when i run logstash it starts overwriting the values.Example:February's data is overwritten over January's data.
The same happens for all months.All months data is getting overwritten with January's data

Can anybody help me with this issue?

Can you paste your config?

In filter plugin i gave format as dd-mm-yyyy it worked for sometime and suddenly it started overwriting.

I changed the format now to yyyy-mm-dd and its working fine.

Can i know why logstash suddenly stopped accepting that date format

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