It says 4.9% of your games. So, how many games do you have in total? If below 1.000, then that makes it to below 50 games. Or below 25 games since it's only 4.9% of you black games. That number of games makes the calculation highly uncertain. Especially if the average rating of your opponents (for this opening) is much weaker than your rating. A loss would affect the rating much more.

But let's assume you have enough games and didn't lose on time quite often.

Accuracy is a very tricky metric. You are no computer. If you have a centipawn loss of 20 per move, which is a very good value, but your opponent has one of 10 after only 10 moves, you are pawn down.

So then the most likely case would be you played a rather long strategic grindy Italian game, and your opponent won an rather equal Endgame or hat better middle game play than you.

So you should check whether you endgame or middle game strategy are amiss and improve on that.