Wellcome to MSI mission bug.

Hi guys.I started to farming gold and kills for the Wellcome to MSI mission but something happend i was 250k gold and 315 kills and when i started one more game and i got 5 kills but after the game something happend and the missions was 244306 gold and 293 kills can someone tell me is this a bug or not.And if it is a bug RIOT FIX UR GAME