What is wrong with the zing bails in IPL 2019?

Rajasthan Royals captain Ajinkya Rahane believes umpires may think of declaring a ball dead if it hits the stumps but fails to dislodge the bails. In their match against Kolkata Knight Riders a ball from Dhawal Kulkarni had got an inside edge off rival opener Chris Lynn and hit the stumps but did not dislodge the zing bails. There were couple of more such insta more