Since the launch of season 9 and onward d.va’s ultimate has been getting kills that appear to be completely out of los or hitting heros despite being within cover. this is highly common in standard competitive play. there have even been several instances of players dying behind rein shield i guess its do to a slight extremely slight angle in the shield allowing a line to be drawn from the player to the d.va in those instances.
Post replay and time code. Otherwise it’s very difficult to investigate issues like this that could be entirely based on subjective observation.