It is entirely possible to not freeze 4 times in a row. Not a bug.
You'll have to give a better example of casting range.
As far as the freezing part goes, the spell does not splash - it hits, even does damage, but the guy does not freeze. Moreover today I experienced this same thing on a next level - found a guy in wildy barraged him, the cube appeared and everything and he did not freeze, there was no way he could have been immune to freezes.
And about the casting range: I'm chasing a guy autocasting barrage and at one point I just can't land them anymore my character glitches out or whatever and I just can't cast anymore, even though I'm quite close to the dude.
Follow me on one of my PK trips and you will experience things you haven't before. kek