Publication_date article

Hello, I wish someone could help me on a very strange problem in OJS 3.1.1.4 (pt_BR).
I exported an XML file by the system to CrossRef, below, but in publication_date comes a date (1969) that I do not understand how it was generated.

prpbem

Hi,
They are diffrent dates.
First for issue, second for article.
Look at slides:

For issue:
issue

For article:
article1
article2

Regards
Peter

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