This might be due to one of the following reasons:
You have not raised any order for the product.
The value of a product (retail or consumables) comes from the unit price at which they are brought into the center using a purchase order or transfer order.Create and raise a purchase orders to get the value for your stock.
Note: You can use the import option to get multiple purchase orders in the system.
In this case, you will see the Value and the Tax Paid columns, but with zeroes.
The Hide Price permission is enabled for your role.
In this case, you will not see the Value and Tax Paid columns in the Value report and any other report or page in the Inventory where these columns exist.