The total value is based on the close of market price for recently-traded stocks. In order to calculate a value, there must be a number of shares to multiply against. Users may see returns with zero values, quantities, or transaction prices (or even dates).
In such instances, there is no total value because there is either no multiplier or value to calculate.

Generally, the stocks returning incomplete information are older or inactive--inactive stock will not return a last transaction price. A zero value will show on any stock which has not traded in at least ten years. If you see  zero values on a return, but the stock has traded within the last ten years, a quick review of the company listing or ticker will verify if the company is no longer being publicly traded. This can happen as a result of company mergers, acquisitions, bankruptcies, or court-ordered restructuring.

Having to verify such returns are outside the scope of our wealth-screening tools will sometimes be necessary, especially given today's economic climate, but this should be an exception and not a general rule.