Why does my striker miss so many PKs?

I have a striker with:

Finishing 17
Penalty Taking 19
Composure 13.

He has made 12 of 21 PKs.

Why does he miss so damn much???

Would say the composure is dragging him back, also check how he handles the pressure of big games, as well pressure in general. Concentration might also be poor maybe? Or you're just unlucky, it can happen sometimes. (Maybe the game is treating it as a 1v1.. never score those)