i dont like much to enable the auto-saving replays so i press F
the problem is because when you are in a server with 3 or more people,after match ends,but the replay keeps showing you go save the replay,but the player on uke(2) go last,and the spectator go to uke pos(2),on the saved replay the player 2 isnt the pllayer wich you was playing with,in other cases when you are player 2 and win and go save the replay,you goes to place 1 and the spectator will be on uke pos(that was you) resulting in the replay showing him killing you instead of the normal that was playing.

easy way to explain:
player1
player2(you)
player3

player2(you) won the match
then during the replay showing save the replay
and the saved replay will show the player2 replaced with player3 and player1 is replaced with you.