This, exactly thisSh0keR wrote:
It happened me the other day, I passed a map with 98 acc , let's say it gave me 10 pp (not really, just as an example) then the next day I played it again got a higher score, but I had only 94 acc, and the play was worth 3 pp, so basically i lost 7 pp for getting better score with lower acc.
and yes the numbers are just made up but you get my point
Also you can definitely make plays that are worth more pp than your current "top play" but with less score, hence also ripping you of your pp and throwing it to shit. This happens way more (and way too) often