I've just imported a single Party MTT I exported from PT2, and it includes the win info, but not the buy-in. PT3 won't be able to import any info that is not in the file exported from PT2.
Could you please have a look at one of the tournament files and see what summary information is included?
If there is some info included which PT3 hasn't imported, or if you can't work it out, please attach the file (or a few) to the
Support system.