Maiev's Fan of Knives, bugged?

So i noticed this three days ago when i started playing with Maiev again that if i throw Fan of Knives at an enemy Hero that it didn’t deal any damage but i could see them getting hit (the Fan of Knives animation was clearly ontop of them).
This happend many times and its especially frustrating when someone has 1% health and survives because of this when it clearly hit.

Is the animation just weird and uneven or is it a bug?
It’s very very annoying.