The beginning of the PSR report actually explains why, but it's easy to miss especially when you're new to Dramatica:
When you begin creating your Storyform, you are presented with a "perfect world" view of your story in which plot is completely aligned with theme. There is no discrepancy between the two, and therefore no dramatic tension. This balanced view is most easily seen in the Theme Browser, available through a tile on the Dramatica Desktop.
Once you arrive at a Storyform, however, you have input information about how that "perfect world" is twisted and warped by problems and conflicting perspectives. As a result, plot no longer matches theme, and the two are often quite out of step with one another.
So what it's saying is that the various inequities at the heart of your story have twisted the model so that the Variation quads are explored within different "parent" signpost Types than they would normally belong under. Does that make sense?