All airflow will want to
move from a high pressure to a low pressure, so if the point of the lowest
pressure is at the point of maximum camber, the airflow will accelerate from
the LE until it reaches the point of maximum camber (lowest pressure). Now it encounters
the adverse pressure gradient as it moves further aft (pressure increasing as
you move towards the TE) it slows down and eventually gets so slow that it
separates from the top surface.
As you increase angle of attack the airflow reads the point of maximum camber
as moving forward, so the point of lowest pressure moves forward (CP moves
forward) the adverse pressure gradient gets worse and the air flow separates
further forward.
So at small angles of attack the separation point is virtually on the TE and as
the CP moves forward, as angle of attack increases, the separation point also
moves forward.