How to change RELAY to DIRECT

hello, I met a problem:

I have 3 peers:
A : openwrt router, use zerotier/zerotier docker image
B : windows PC in router LAN,
C: windows PC outside the router LAN.

C to B is DIRECT ,
but C to A is RELAY.

i use ‘netstat -tunlp | grep 9993’ on router A, it shows:

it use TCP but not UDP, I think this is the matter , but I dont know how to do.

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