infinite exp glitch

i was playing normal strikepoint and lobby wasn't full i had 3 squad mates but my opponents was only 2 players but after 3 round they abandon and we won and i only had 1 kill and for some reason i got infinite exp before next match starts and i level-up from 52 to direct 67 it wasn't community server it was official matchmaking if hadn't clicked space bar to continue i might have level-up more 

pls give me free battle pass for this season for reporting this bug if possible