Is there desync here?

Just had a match, playing Shen, ping was between 40 and 70 the entire time (normal for me, usually no lag unless my ping spikes up to 300 or so, generally doesn't happen but if it does a reboot fixes it).

I did not experience any noticeable lag in play or chat, but every time I E'd, I would dash across the enemy champ and they'd not be taunted. No spell shields in play. Is that desync, or something else? I've never heard of desync in LoL, so the experience was very confusing (not to mention frustrating).

And I'm not saying I never miss my E, but 80+% of the time I land it. In this match, though, I never got the taunt effect out of it. Got my ADC and myself killed several times :/