First, the bug: When you hit enemy heroes with your E you are supposed to increase the damage of your E by 5% up to 250% (as stated in the patch notes) but it just doesn’t 1 or 50 stacks there is no damage increase
Second, the tooltip: The reward for hitting 50 enemy heroes with E says “after hitting 50 heroes, Tyrande’s Basic Attacks ocassionally trigger a Lunar Flare” i (and many others) think that it should say how many attacks it takes to trigger Lunar Flare (atm it is 8, just like L20 talent “Shooting star” in live but without extra range)
Third, Realisticaly not a problem: When you complete the E quest milestone “10 heroes hit” you get extra range, it works properly, but if you are in "trial grounds”, complete that milestone and reset talens you keep the extra range and if you keep repeating that you will get infinite range (This also happens with Lucio’s L1 W quest “Party Mix”)