Blue: Test failed at that item, so the item is completely un-weighted and culled from the results. Usually occurs when a value is filtered out, such as using a Distance Test and filtering out any Item over (or under) a range. If you don't want a value to be culled completely, use the Clamp Features in the scoring section.
Green-Red: Green is more desirable than Red. The number listed on these is the weight of the Item. If previewing only one Debug Step, this value will be the final value from the selected Test.