This is because WPN does not write tournament summary files for the results of the tournament itself. All they write are hand histories which do not contain buyin, finish, prize, etc info.
Any tournament with more than 1 table (and some single table games) will require a separate Tournament Summary/History file to be imported for HM2 to properly calculate the size, places, and prizes. Without this information it is impossible for HM2 to work out the correct results. The only sites that currently write these summary files that we support right now is Pokerstars, Full Tilt, and Pacific. If your site does not write summaries, or you experience any discrepancies with the results, you will need to manually edit the results via the Reports > Tournament > Tournaments > right-click > edit - http://hm2faq.holdemmanager.com/ques...rnament+Editor