QRZ logs only minutes not seconds as does LOTW so when you upload QRZ to LOTW even though you check only new Q's. you will get your log duplicated because of the time difference..how can you stop this??
I answered your support ticket. QRZ logs seconds if seconds are provided in the log info. You are using the API and external logging software. Be sure your software is set to log seconds. 73, Steve KF8KI