DOF Metahuman problem

My problem is the only head part of the Metahuman doesn’t have the same depth as the other part of the body. So when you render it by using a low aperture and focus on the body, the head part will blur the same as the bush in the foreground.

Any idea how to solve it or it can custom the DOF

//My camera is quite far (1709,1691,285) because I using 105 FL to make pseudo isometric

DoF data

Scene depth

I didn’t know if this is related or not but when show the debug focus plane. That head part, is just separate from each other.

I found the problem might same as Hair clipping problem. So, I try set the near clipping value back to a normal amount and restarted the project and it was fixed.