No. The stun duration and how long it took for the goblin to react to it is completely normal. Go test it in the current game yourself. Put on shock spikes and go kill crabs, move behind them as soon as they are stunned wait for stun to disappear and afterwards it will take the crab at least 1 second to turn around again.

Sometimes debuff/buff icons disappear before the effect actually wears off, I assuming its server delay or something.