I made a single change in my input which was to sell my ptimary residence at age 70 with 603K equity in it and bought a new one with no mortgage for 450K. Yet the net worth at the end is 380K less although I bought a less expensive home, kept some of the equity, had lower taxes and no mortgage.
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It's hard to answer this question without seeing all of the data--but one of the program engineers may be able to tell you what's going on.
Remember there is a 6% (that's the default setting) cost of selling home. But look at the Net Worth statement and see that the last column is the sum of all of the columns to its left. Also compare this Net Worth report to the Housing report in the detail spreadsheet and perhaps you'll see that the numbers do add up.
The housing reports have been looked at pretty closely, so it's probably just a matter of understanding what the numbers mean.
Best,
Dan