ZBrushCentral

How to have two symmetry point?

Video here

I watched an instructional video and followed the instructions
But I ran into a problem at 4:06 in the video
I turned on L.sym like him but got different results.
He can mirror to another skirt at the same time with L.sym turned on
And my other mirrored skirt folds askew,
how to fix it?

It’s great to have a discussion forum like this,
I’ve been searching on Google for a long time and haven’t found an answer.