updpacket not received at specified port...bug?

I have a UDPsocket initialized on port 56000, I send a udpPacket initialized with port=56142. Wireshark confirms that the srcport=56000 and dstport=56142 as expected. The receiving end has UDPsockets on 56000 and 56142. The packet is received on the 56000 socket, not the 56142. Is this a bug, or a user error?

I'm using jnetwork v1.2

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