Karma Auto-Attack doesn't feel very responsive

I don't play Karma on a consistent routine, but there's definitely something different about her auto-attack. It feels like when the projectile lands on an enemy (minion), then follow up the damage; it's a slight delay rather than damage follow up immediately based on the projectile.

I just played Karma and am testing it on Custom. Some of the autos seem fine... but I notice some of them was not responsive, causing my previous game to miss many CS. This is the 1st time I played Karma after patch 5.22 and I've never really missed CS on those last hits, until now.