Steam-RedSec-BR-Quads-Weapons- Poor hitmarker consistency

I went frame by frame with this video I attached and the weapon isn't even up nor can you tell it's shooting (they don't have a silencer/flash hider on it -- it looks like a compensator) at me. I come up and start shooting I don't get a single hitmarker with shots going at the person in the crossfire and yet they hit me. I die because of this issue!

It seems like my shots weren't even being read while I was actively pressing the fire input at the time, this all starts at 27 seconds into video provided.

1.) Load game

2.)RedSec -- BR Quads

3.) Squad up

4.) Head to Construction

5.) Second floor -- near crane but the one closer to Defense Nexus

6.) Equip M4A1

7.) Have enemy near wood pile

8.) Have enemy facing wood pile

9.) Equip enemy with SG 553R

10.) Go sliding at enemy from the side start firing

11.) Stay crouched and fire

12.) Have enemy fire at you while not looking at you

13.) Observe bullets do damage

Actual: Bullets do damage even when target is not in aimed at

Expected: Bullets don't do damage while target is not aimed at