Vi's ultimate "cannot be stopped" part ignored by ultimates like Lee Sin's or Tristana's

Vi's ult stopped
Uploaded by Shiraho on 2018-12-27.
So it's the second time (didn't highlight the first time with Lee Sin), I ult Lee Sin/Tristana from near max range, they use their ult and I get pushed away, my ult is wasted. The problem is : 1. During the charge, Vi is supposed to "cannot be stopped", so their ult shouldn't work there. 2. When Vi is on the target, she's supposed to bump them, so their ult shouldn't work when bumped. Maybe I'm missing something, but this highlight for an example doesn't quite feel right.
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