Why do some products rows are missing from the Bulk Editor screen.?

Why do some products rows are missing from the Bulk Editor screen.?

Only Warehouses having "Fulfillment method => DropShip or pickup". Shows the products in the grid.

To know more about the Mass stock or the Bulk editor screen, please refer the below link:
https://help.boostmyshop.com/portal/en/kb/articles/mass-stock-editor-27-3-2019​