Ajax PasswordStrength seems to allow passwords that don't meet criteria

<asp:TextBox ID="txtPassword" runat="server" TextMode="Password"></asp:TextBox><asp:PasswordStrength ID="txtPassword_PasswordStrength" runat="server"
                Enabled="True" TargetControlID="txtPassword" MinimumLowerCaseCharacters="1" MinimumNumericCharacters="1"
                MinimumUpperCaseCharacters="1" RequiresUpperAndLowerCaseCharacters="true" CalculationWeightings="25;25;25;25"></asp:PasswordStrength>

I want passwords that have upper and lower, and numbers, special characters are nice, but not needed.

I am not sure why this says a password is 'strong' when it does not include the characters that I indicated.