WHY THE NETWORK-LOOPBACK SHOWS WRONG DIRECTION?

Why the example of network-loopback as same as the mirror one? When I moved my right hand,the mirror moved right side hand(its left hand), and the network-loopback avatar shuold moves his right hand too, but now his behaivor looks like mirror....

(Does it make sense? sorry for my poor English...)

Sample screenshot of the “developer.oculus.com/documentation”

Me: right hand

He: right hand

Actually in unity sdk's Sample screenshot :

Me:right hand

He:left hand

Help me!!!!!please!!!!