White still has a first-move advantage. Although it's a very debatable topic, one thing that is pretty commonly agreed on is that the first-move advantage allows White to steer the game more than Black can. I think that in itself is a reason for a higher win percentage.
A difference of four percentage points is pretty standard.
^^
Most games that I play aren’t really lost in the opening so... just luck or is my black openings just that bad lol.