Missing Kills on Service Record

I posted about this in the Halo 5 forum last week, and still don’t know why this is happening, but it has gotten worse. Last week I noticed that my in game Arena stats showed more kills than on Waypoint, but all of the other stats were the same. Deaths, Games Played, etc. were all correct. At that time the difference was -48 kills on my Service Record compared to in game. Today, it has taken an even bigger jump. Today I am showing that I have -71 kills, -6 deaths, -1 game played, and -1 Win

So here is how it looks

In Game:
Kills: 4630
Deaths: 4379
Assists: 1941
Games: 440
Wins: 215

On Waypoint:
Kills: 4559
Deaths: 4373
Assists: Cant Find on Waypoint
Games: 439
Wins: 214

I don’t know what is causing this, but the increase in difference could be because of the one missing game, which is a game I just played where I had 19 Kills, and 6 Deaths in a win. So that could explain the bigger jump from last week up til today, but then that still leaves 4 kills un accounted for on top of the 48 that were missing last week.