Why WEB08S-TA keep sending the same record?

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WEB08S-TA is an 125 kHz cloud based web clinet IP RFID reader. It collects time data via RFID card and store in the memory of the WEB08S-TA. The server must send back the REC_DEL command in order to remove the record after the server got and processed the record successfully. Otherwise, the reader will continue to send the same record.