The list box will display only the numbers equal to the number of HTML features that you have selected. For example, if you have selected, Mailto Hyperlink and Hyperlink, the list box options will be 1 and 2.
The feature counter counts the number of types of HTML features found in a message, not the total number of all features found. For example, If you have selected Hyperlink and Image Tag, and this option is set to 2, then a message must contain both a Hyperlink and an Image Tag to be identified as spam. If it contains 2 hyperlinks, but no Image tag, then it would not be identified as spam.