I cant confirm what it is, but I have a theory.

A player can only have a single tag laying on the map.  In otherwords if they get killed again, the previous tag will disappear and be replaced by the new one wherever they died.

Okay, I dunno then. I have experienced it, some times they are there for a short period of time, and then others, they go really quick. Who knows, there is so much broken stuff in this game it really could be anything! I was going to suggest re-spawning, ie, your watching your kill cam, or not, might make a difference, but tbh, I'm clutching at straws!

Whoever posted above me is correct. You can only have one tag on the ground at one time. So you killed someone, and then he died again before you can pick up his tag. Check it out in theater/private match.

i have had mulitple tags on the ground at the same time, i do not believe that's the case. i would be more inclined to agree with the fact that if you killed someone and you do not retrieve his tags before he dies agian, that then, they would disapear, therefor he doesn't or can't have 2 seperate sets of tags worth 250xp sitting out on the map.  having said that, i have killed the enemy before and right as i'm about to pick up his tags, it says "Kill Denied" and there was no one even remotely close to me or the tags... i'm gonna put my money on "It's a glitch in the game itself" and that it will be a while before it's fixed.  not that it happens all the time, but i play Kill Confirmed a pretty good bit.

Yeah it's most likely either the guy quitting or him dying again before you get to his tag. The latter is actually more likely than you think considering how bad the spawns are (especially on a map like Mission), and possibly if someone is camping their tac insertion.

I had the exactly same problem when i was playing Face Off with my friend and he told me that that guy was using a Tacticial Insertion so it wouldn't be fair if i killed kim then my friend killed him instanty after he died but the bad thing is you dont get any XP if you did the original kill

I had the exactly same problem when i was playing Face Off with my friend and he told me that that guy was using a Tactical Insertion so it wouldn't be fair if I killed him then my friend killed him instantly after he died but the bad thing is you don't get any XP if you did the original kill