Without more details it would be hard to say ehats going on. There are cases where taunts reapply, or maybe nest missed.
Well I wasn't asking for an explanation, but since you bring it up, you already missed one of the details that I did give:
I've quite clearly seen my Nest hit without dispelling taunt. Doesn't happen a lot, but it happens.
I'm not talking about cases where Nest missed.
That said, I don't really care since I've only seen it happen events, and since I can beat all the events in which she's useful even with taunt surviving an attack, it's not worth it to me to even report it to CG. I only mention it so that the other people who thought they saw that happen to them don't think they're crazy.