It could be the unique animations for certain players but I've noticed that a high shot power stat doesnt always mean the player's shot is powerful.
Ill use some examples that most people have probably used.
Rashford for example feels like he has 85+ shot power (Has 82).
Martial feels like he has 80 or less shot power (Has 84).
Dembele feels like he has less than 80 shot power (Has 83).
Rashford's shot is noticeably more powerful IG.
This may be old news but I wonder if anybody else has noticed this.