Can you solve the "puzzle"?
Speculation #1: Perhaps the landing gear was not fully down anymore for the go-around? A few posters seem to think this is a possibility.
Speculation #2: A panic pull on the stick leading to a g-stall / high AoA and sink rate. Have no idea if control laws would allow this. Also the actual airspeed (margin to Vs) obviously plays a role here.
But FDR/CVR will obviously tell.