PROJECT: Fiora Vital Bug

Occasionally when I'm playing there will be two vitals that appear on the enemy, if I go up near them and attempt to proc it, only one will work, then if they go out of my passive range a vital will still be on the enemy. It may be similar to the bug on this post http://boards.na.leagueoflegends.com/en/c/bug-report/esqrET7N-gameplay-fioras-ult-has-a-visual-bug