The USD limits that you are referring to are a result of a hand history change that occurred at PokerStars quite a while ago. If you upgrade to the most recent version of PT3 (Beta 29.1, available on our
download page), then export and reimport the USD limits, the hands will import as normal, non "USD" hands. You can then purge the USD limits and the hands will be merged and all of the data will show up together on the summary tab.