Why don't the shots count at Fortnite?

I have a question I have a Ps4 Pro and play Fortnite and play a solo round there and then the shots don't count and I'm on it why and what can that be?

You mean you don't meet? This is due to your aim. The Autoaim doesn't always work. You can improve your aim on various creative maps.

But I'm on the enemy.

Yes, but you don't have a 100% hit chance, so you don't hit every shot