create new product save there value in database as null

[thedestiny]

hello,i have prestashop 1.7.3 version

when i add new product on back end and click on save button than its display setting updated

why its display setting updated? actually  i`m the insert new product

and after successfully messages product not listed in product list so i check in database then product save as null value mostly,like reference.product name etc  i enter during insert product

 but save blank value on database so on front side and admin product listing those product not display

what is the issue?is their any bug or error?how to fix this issue??

thank you