WTFT

My last unit Zyra was 1v1-ing the enemy Vayne. Zyra casted her plants then died, plants killed Vayne then they ran out. I lost the round despite I had "units" while my opponent did not. I was like "oh I guess this is how it works".

Literally in the next game my last champion was against a Zyra in 1v1. Zyra casted her plants then died, plants killed my champion then ran out. it was the exact same situation (except I didn't have a Vayne). Guess what? I lost again!!! What the actual fuck Riot?