Re transmission bit is set even when packet is transmitting for first time in AP-STA Concurrent testing

Hi ,
Test case scenario : STA-AP Concurrent test case.
1. STAUT interface of CSR-DUT connected to Cisco-AP1252AG and T.P Ref Station Atheros-9462 connected to APUT-CSR.
2. Run Rx traffic between Cisco-AP1252AG to STAUT-CSR and Atheros to APUT-CSR ( i,e TCP Rx/RX ) Simultaneously .
Observations :
1. Re transmission bit is set for packets transmitting for first time -- As seen in sniffer , Please find the attached file -- Retransmission_bit_error_capture for the instance show like wise we have many instance of the issue occurrence .
2. There might be chance where sniffer is missing these packets but at the same time DUT cannot miss and we should be able to see Block ACK from DUT and this is not happening and more over it is happening at many instances also refer the attached sniffer capture -- TCP_rx-rx-25-19Mbps for further investigation on the issue.
Please some one help us to understand / solve the above issue explained.
Thanks,
Jagadeesh

Rather hard to put the pieces together without seeing the entire capture.

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