That is the [List Item] component. In the latest GH versions you can zoom in on the component and add additional outputs for +1, +2, +3 etc. and -1, -2, -3 etc.
So u seem to have the same issue as me then? I have to explicitly change it to 0 1 2 3, the default is not this it is 0 1 3 2. Converse for a tru face it is as expected, default is 0 1 2.
Added by Steve Lewis at 7:00pm on December 24, 2013