The quick answer is: Portfolio Size. In the Detailed Analysis, you'll see only the trades that were pulled into the portfolio. So, for example, if you're looking at a Portfolio Size of 10, the results will include just the trades that filled the portfolio up to a maximum of 10 positions at a time. But the results won't include the other potential trades that were bypassed due to the portfolio selection.
Most columns in the Combination Results Listing, on the other hand, are not based on a portfolio selection and are therefore based on *all* potential trades. In your example, all of this means that there were 800 buy signals produced by the entire system, but only 255 (175 wins plus 80 losses) were pulled into whatever portfolio size you're looking at in the Detailed Analysis.
The exception to this rule in the Combination Results Listing is the xPortAPR columns. Those APRs are all based on their respective portfolio sizes, and provide a glimpse into what the portfolio returns would have been, without actually running a Detailed Analysis.