Weird

I have 39071 kills on my locker room.
But on my career, it says I only have 37,190 kills.

Not really a big deal but I find it weird.
It's maybe because of 100 host migrations per game.

What do you guys think?

Just like you, I think it's weird.

Not sure what to tell you but it may have something to do with updates.

Kills by bots, annihilator kills, fire kills, mele kills, etc. None of those are recorded in career so your total kills will be higher than the combined total of career kills.

No, I mean I combined all of the enemy kills.
This is what I'm saying : (for example)
I have 100 kills on locker room but it says I only have 60 kills on career.
I have 10 Assault kills, 10 Tank kills, 10 Support Kills, 10 Assassin kills, 10 Gunner kills and 10 Sniper kills. (60 kills)
The other 40 is missing.

Well the class kills protags came out with the DLC. Any kills before the DLC came out won't be recorded there

Ohhhhhhhhh. I see.