EarliestDateStamp for OAI Identity Validation is not up-to-date

Hi, I am having an issue regarding the EarliestDateStamp in the OAI Identity Validation [https://www.belitungraya.org/BRP/index.php/bnj/oai], which is in 2018; but not for the DateStamp in the ListRecords, ListIdentifiers. Please see the pictures below.
OAI Ealriest datestamp

I have read some contents in [OJS 3.2.1-1]: OAI earliestDatestamp problem, but I guess it is a different problem.

DRIVER and OpenAIRE plugins were disabled in our OJS.

Checking using https://validator.oaipmh.com/, I haven’t seen any problems. So, my question is how to update the EarliestDateStamp for OAI identity?

And, in our journal, we set several article sections. It seems the problem occurs in the section Original Research Article bnj:ART which only recorded until 2017-12-28 (see https://www.belitungraya.org/BRP/index.php/bnj/oai?verb=ListRecords&metadataPrefix=oai_dc&set=bnj:ART); but, the other sections are fine (For example: https://www.belitungraya.org/BRP/index.php/bnj/oai?verb=ListRecords&metadataPrefix=oai_dc&set=bnj:TCD).

We just updated the system to OJS

Your helps are highly appreciated.

Best regards,

Hi, I have found a solution for this.

I was checking the record of article section in the database and found a duplication of section’s name and abbreviation. Now, the ART section is up to date.

Thank you