in game match history

for some reason in the past 2 days some of my games have not been showing up in my match history and once it showed me my previous game after my game ended. it has only gotten rid of my bad games, like my tristana game where i went 10/1710 or something (im not an adc lol). then it got rid of my most recent game where i played ekko and went somthing like 11/14/17. it seems to only do this for games where i have lots of deaths.