Home Sale

I sold a home last year that I had bought in 2005 as my primary home, then converted into a full time rental in 2011. I have entered my home sale information but believe the taxes the program is asking me to pay in are too high. My Gain on Sale on the Home Sale Worksheet is shown as $80,745. I don't understand how the gain on sale can be this high when I bought the home for $138K and sold it for $180K and had $29K depreciation over the ten years it was a rental. The adjusted basis of the home sold is shown as $87,991 but I don't know where this number is coming from. If I click the Quick Zoom to Adjusted Basis of Home Sold Worksheet link that is shown between lines 5 & 6, that worksheet is totally blank.  See attached screen shot. 

 

Part I Gain or (loss).JPG