Is the shaft I'm playing too soft?

So I went to the range today and decided to film a couple of my swings. And then I used an app to put it in slow motion and I noticed something strange. My shaft is flexed so much near impact. Is this normal?

I'm playing Taylormade R9 TP's with the stock KBS regular flex shaft. I use a stiff flex in my driver, 3 wood and hybrid and everything is fine. The club I'm using in the pictures is the pitching wedge. Is it time to reshaft my irons with stiff flex shafts?