Its bothering me so much

http://matchhistory.na.leagueoflegends.com/en/#match-details/NA1/1920910675/209222462?tab=stats (i know my cs is crap) whats bothering me is how i warded more than both supports in a 50 minute game no matter how much i think about it, i cant wrap my head around how this is possible. Can someone please explain it to me ;-;