I have a problem with Xgen, about braid hairstyle

I have a problem with Xgen. I have a braid hairstyle, but the end is cut off
With the shape of the end of the arc generated by a plane,
After I tried to turn on Simulation, the braid on the upper half was complete and it could be followed during the movement, but the lower half became independent and could not match the dynamics of the upper half.

Is there any way to achieve it at the same time. When the simulation is opened, the upper half can stick to the lower half without staying in place?