When I was playing Papa Saw without Double orbs, I was able to get 24 orbs, but when I used double orbs I only got 16. This was on Hard mode, and this isn't including the total I received from others, just from winning the round. Is this a glitch or are you supposed to receive less? Thanks!
The number of orbs you get each time is random within a given range. It's likely that you were just unlucky the second time. Keep fighting a few times and make notes of how many you get for each victory. After ten or twenty runs you should see what the limits are.