That's about the only thing I noticed with my endless gray entries. They seem to be climibing. Of course, it gets a bit muddier because, in between, there are new gray entries, and it gets more and more difficult to follow. It would be nice if they could be turned off somehow.
Try to use the filter on the top, instead of All there are two "Mined" options. I have no gray mined so I cannot test it.