Ingame Lux Ulti Bug [GAMEPLAY]

I found a bug with when I played with her against my friend. I only tried that in Urf but if you

1. use Hextech Protobelt and then
2. Spam your R button then Lux will Ult more than 1 times, it goes up from 2-4 times and only the last ult will deal any damage I hope it's only a URF Bug and it will be fixed very soon

Riller