End of Round accuracy?

Let me first say that I usually never pay much attention to stats or my KD ratio in any games mostly because I only have 1-2 hours per day to play a game and until Battlefield 1 I barely even played my PS4. But I have fallen in love with BF1 and it has easily become my favorite multiplayer game. I had a .3 KD ratio until the last 2 months where I've climbed to a 3.0 KD ratio, I have never been this good at a multiplayer game until now.

Naturally I've started paying more attention to my stats since I have gotten better. One thing I have noticed is "End of Round" inaccuracies. For example the other night I went 29-0 but when the match ended and we were back in the menu waiting for the next map all of a sudden it said 29-1. A couple games later I went 22-0 and again it showed 22-1. Last night I was playing with really good people and it motivated me to be the best player that round and I ended up 1st with most flags captured and I went 39-0 but then once again afterwards it said 39-1. A week or so ago I went 50-0 but that time it actually stayed 50-0.

So sometimes it leaves my score normal and sometimes it adds a "1" if I go the whole map without dying. Does anybody else have this issue? Is this normal or something (didn't play much of BF4)?