Game engines and tweaks may make the calculations of the controller and accuracy slightly different. It's just practice to get used to whatever the engine is set to.
So the likely cause is that your muscle memory is perfect for old cod games but newer ones are slightly different so you've just got to work it out again .
There's only 2 races: White and 'Political Agenda'
2 Genders: Male and 'Political Agenda'
2 Hairstyles for female characters: Long and 'Political Agenda'
2 Sexualities: Straight and 'Political Agenda'