We are currently building a new home. The shingles on the roof appear to be from a different batch (i’m guessing) because some of the shingles are slightly darker than the rest. As you can see in the picture, there is a very large patch of shingles at the bottom that are darker than the top. There is also another patch similar on the front side of the house. It has rained several times and there has been no change.
When I mentioned it to the builder, he said that there were “extra granules” on those shingles that needed to be “brushed off” and that this is “pretty common”. None of the other houses in the neighborhood have this problem.