Is CGC decreasing the values of comics this year?!?

I have one of the tope registered sets of Incredible Hulk #102-474 with many silver age classics and I just notice that my registry value was just diminished by over $800 without me selling or dropping books. When I looked at other registered owners, I noticed that they too have almost all lost value in their collected sets, of differing amounts, and suspect that the entire collection has been devalued somehow. If anything, I thought these books would grow in value - such as the 1st App of Rocket Raccoon which has been seriously undervalued by CGC and not reflective of EBay sale prices for the last two years. Just wondered if anyone has a clue or has seen similar reductions to their collections.

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