Weird math on [X] of the Wicked Snare (and its evolution) interfere with Ethereal Cloning Pads's legendary effect

[のヮの]

I have +0 additional projectiles and this weapon gives a percentage bonus to additional projectiles. Without it equipped, the bonus from Ethereal Cloning Pads (shoulder) lets me fire 7 projectiles (7.2, actually). This weapon—at level 60 and Adrienne 100—gives me +90% additional projectiles and, while equipping it, I fire 2 projectiles most of the time but I also fire the 7 projectiles sometimes (I'm guessing 90% and 10% chance for 2 and 7 projectiles, respectively).

Looking at my stats, it says I have +0 projectiles but with an added percent of 90% (which, according to regular maths, should still be 0).

I then leveled the weapon to 68, giving me 102% additional projectiles and, sure enough, I now fire 2 projectiles with a tiny chance to fire 3, and can no longer trigger the bonus from Ethereal Cloning Pads. And my stat sheet still says I have +0 additional projectiles.