It's a matter of how SQL works - when you're looking at Hands Summary with the default setup there's data that is true from every player's perspective on the hand. As soon as you add something like amount won that differs for every player - so you can't group it all together in one row. The result is you get one row with each distinct set of information.
Think about it like this:
You have some hand with a date, time, and some board cards and you add amount won to the report. If the amount won is $.50 for one player and -$.55 for another player, how could we show it in one line?