Having problem for two Ncloth near each other

As you see in attached photo, I use ncloth (Cloth system that is new in UE4.16) to the scarf and sling, inside Unreal. they have separated material and everything is ok when I use them separately. but they softly swing through each other when I have 2 of them near each other, like there is nothing there. I have lots of characters with lots of different cloth. is there any way to avoid these things happen?
I already have tried “CapsulePhysic” to control the movement of cloth. but it wont help correctly.

I’m waiting for any help. Thanks

Why does no one answer?

i have this problem too