about the Graphmapper and the Domain2 Component

1. In this example, a Graphmapper is used to divide the U values of the domain unevenly, both lower and upper limit of U(together 2 sets) are imported into the graphmapper, but when i set the Graphmapper type into "linear", (which is expectet to divide the value evenly,because i just tried to make it easier for me to understand), i found a problem, the order of the 2 sets were exchanged,quite the reverse(that can not be seen in my screenshot, because the 2 sets have 288 values, i can't make them all in the screenshot, they are to long).So why are they exchanged?

2.In this example, the lower and upper limit of U are again imported into a "Domain2", which correspondingly has a U0 and a U1 on the left side. But i found in the example that the upper values have been imported into U0 und the lower values into U1, so the values in U0 are higher than the ones in U1. Why is that?