You administer your new screening tool in your health clinic but find the results confusing

You administer your new screening tool in your health clinic but find the results confusing. After reviewing your screening tool, you realize that the following mistake was made: When the survey was administered to three of the male sports teams, it was printed on only one side of the paper and should have been copied onto both sides. As a result, half of the survey was missing when it was administered to these three teams. Is your screen reliable? What does this tell you about the validity of the screening tool in this situation?