They did look that way a little bit. It is because he was moving from left to right while reacquiring his aim with each consecutive pull of the trigger.
From the inside of the door, just look at the overhead photo taken from within the WC of the trajectory rods. Look closely and see that all of the rods point to a single area in the WC, they point to Reeva's head and upper body, and that is where the bullets hit.
Looking from the outside of the door his grouping is extremely tight vertically, and it does not vary much at all; his horizontal grouping is equally tight. All of that given that after the first shot his target moved as Reeva fell, screamed, covered her head, etc... and OP was moving left to right.
The bottom line is this, the grouping on the outside of the door made while OP was moving and firing means very little. The grouping of the bullets that hit Reeva, she is the target, not the door, is extremely tight with 2 of the 3 last bullets hitting her in the head and upper arm. That's successfully making a headshot and an upper center mass (area of her upper arm). That is a very good grouping.