SKU / Product reference remains always de same in mails, order confirmation

[Lorena]

Hello,

There is a strange thing in my shop. I have introduced a reference number for each product as "150A2F080064BK", different for each product obviously, but in all mails to customers and in all confirmation order screen, the product number appears exactly the same, something like this "20180808".

If I do a search from Prestashop backoffice, looking for 20180808 it appears all my products but on the screen I am visualizing the proper reference number I give to them.

It seems something related to the products table.

Could somebody help on this issue ?