Inaccurate Stats and Information (Playtime)

I’ve noticed that my stats, especially my playtime stats are way off the mark and appear to be bugged.

With my Halo 3 Campaign playtime, it currently reads at: 2637:71621:4295024, a numerically implausible number is there ever was one. It doesn’t make any sense.
All titles campaign play time is at: 2895:71630:4294997

Here’s an example:
Halo 3 campaign playtime:
2637:71592:4295016

After playing for 17:13
2637:71610:4294970

Playing again for 11:53
2637:71621:4295024

Here’s another example:
Total Campaign playtime:
2895:71620:4294968

Playing Halo 2: 10:29
2895: 71630: 4294997

What does that mean exactly?

My Halo 4 playtime campaign stats currently read at 121:13:39. This is strange, as I’ve only played Halo 4’s campaign very few times.

This isn’t just confined to the in-game stats, but on my service record webpage, it posts that my total playtime for MCC is around 90 days.
I play MCC often, but not that extensively. It’s ridiculous.

I did my research with the available playtime statistics in game (with the exception of Halo 3’s Campaign statistics) and my total real playtime was only a portion of that reported on my service account (roughly 14 plus days to be exact). And this is over the course of a few years.

So the question is: is this a collection of bugs and glitches affecting the service record and stats? Especially with the numerous updates and the fact that Halo 3 and ODST’s stats appear to be spliced together. If so, I’d very much like them fixed is that’s possible.

Please don’t cross post topics, thanks