question about foreclosure listings

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I have found a couple of properties on the sherriffs foreclosure listing website that are rather peculiar and was hoping someone could help me figure this one out. Property #1 is valued around $190,000. The default amount listed is around $40,000. This auction is tommorrow. What confuses me is that the same exact property is listed to be auctioned off 2 weeks from now. However, the default amount for that listing is approx. $170,000. Property #2 has the same circumstance. Does anyone know the reason for this?