I have heard if you dry hop while the beer has lots of yeast in suspension, the hop oils will attach to the yeast and settle on the bottom when it clears. It sounds like this is what you are experiencing. I'm far from an expert though so take that for what it is worth...
My rule of life prescribed as an absolutely sacred rite smoking cigars and also the drinking of alcohol before, after and if need be during all meals and in the intervals between them. - Winston Churchill