Newly added client disables ones added earlier

[amnixed]

Hello,

I have added the first WireGuard client (clientA), which successfully made handshake, could ping, access samba share, etc.

Then, deactivated clientA, and added the second client (clientB) on the same client computer, and clientB also made handshake, could ping, access samba share, etc.

Then, deactivated clientB and activated clientA, but while clientA appeared to make handshake, it could not ping or make any other connection to the LAN.

Then, deactivated both clientA and clientB, and added the third client (clientC) on the same client computer, and clientC also made handshake, could ping, access samba share, etc.

Then, deactivated clientC and tried clientA and clientB. Neither clientA nor clientB could ping the LAN.

So, it seems that only the most recently added client works.

To test this, I have disabled clientC in pfSense, after which clientB could ping again, but not clientA. Then, disabled both clientB and clientC in pfSense, and clientA could ping again.

I must be missing something trivial. Your suggestions would be much appreciated.