Zyra Ult

I don't have a record of it and haven't been able to replicate it, but in one of my Zyra games recently...(Past 50 games, Don't like foruming often)... One game... I used Zyra ult and the animation went off. not sure if it went through... but the ult was off CD really fast and I was able to cast it again... I don't recall if both Zyra ults did full damage/CC... or if it was a visual bug with the first one cause it was Kind of a bad ultimate...