hmm...I have a very "shiny/streaky" look to mine when I an using Gina K white. I figured that it was just the "ultra smooth-ness" of the paper (it almost feel coated) so I stopped using that particular brand. I wonder if it is the same thing you are seeing.
I first started noticing it when I was coloring in the color chart (printed on Gina K) I thought I was doing something wrong since I was so new.
Let us know if Barbara's suggestion works out for you.