Original price means the price when the listing contract was signed. Properties that have been on the market for a while often show a new listing price due to a price drop. But, there could could an increase from the original price. A house across from my brother was listed at $500,000 and when no bidding war happened, the price was increased to $580,000 (where it remains unsold).
Example from the link:
Orig Price: $324,900 1/12/2012
List: $315,000 price drop at some point
Sold: $307,500 3/14/2012
DOM: 62