Maybe some guy blew himself up and someone else at the same time with a grenade... TIA counts the deaths rather than the kills. I once killed myself with a grenade when the enemy team had 74 kills and lost the game (there was no replay of the final kill)
I had a couple of times seeing this. Possibly server lag and the kill registers are timed-out, so when it comes to register the kills, they register at the same time and bam, there's your 75-75 draw match.