I'm struggling to understand some numbers appearing in the Bitfinex order book.

https://www.bitfinex.com/pages/ll_order_book

Upon scrolling to the bottom, one finds this.



The bid side looks particularly odd/unnatural.  

Let me be more specific: 80% of the total orderbook is under $0.1

Are those bids really backed by real collateral funds held on the exchange(s)?

anyone have a good explanation?