Azir ult moving through champions.

Ive been noticing that certain champs are immune to Azir's ult since the patch. One i'm sure about is Syndra, Can't remember the rest throughout the night but in the last game I played it was hitting everyone except syndra. Was especially annoying when I had her one hit from death and used my ult and it was doing no damage and going straight through her. It did hit everyone else in that match though.