What you are looking at there in many cases is all hands at tables you played/observed where one pair wins. This includes hands where you fold pre-flop, flop comes, say, AAT, one player bets all others fold. Because there is no showdown, PT 'sees' the pair on the board and calls it a 'one pair' hand. It will also include hands where there was a showdown and one split pair wins, or one pair in the hole wins. Anytime you put any money into those pots, regardless of your holdings, it will count against your 1 pair stat. If this happens x% of the times you are in the blinds and fold pre-flop, for example, all that money is counted as a -. Once you extend this to other hands you lose and don't see a showdown, you can see why (unless you can find a great filter that corrects this) it wouldn't be a great stat to asses the value of your play with one pair.

I found my +money starts at 2pair and continues through everything but straight flush(I am + with Royal Flushes but they get their own column). I would think this would hold true for others as well but would love to hear from someone who knows better or has different stats.

It seems that if you check the box marked 'show only hands that were not folded' you get some different indicators, but here as well the results won't be true.