Sharppnes 1 netherite sword

I am 1 trophy away from platnium trophy on ps4 so i gave my netherite sword sharpness 1 it said It did 9 damage ingame (i was getting over kill trophy also my last trophy) but no trophy came when i hit a sheep with it or cow so i waited to night hit a spider skoleton Nothing happend i got my iPad acc to join i tester it on my iPad it did 10 damage when it said it did 9 this is super anoying i am on my last trophy plz fix