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Only data packets can be retransmissions and the second packet does not contain data, so it can't be a retransmission. But it is interesting to see why this packet was sent, as there is no reason for it to be sent. It ACKs the same data as the previous packet ACKed.
One possible explanation would be that the packets switched order underway. Then the second packet (which was sent first) was a bare ACK and the first packet (which was sent second) is new data. Could you check the ip.id of the packets? Or post a pcap of these packets with about 10 previous packets and the next 10 packets of these two packets somewhere to have a look at?
