Did you import the old QSOs into the new log as a ADIF file, or as a XML file (backup)?
If it was an ADIF file, the QSOs will not have all the QSL information in the file.
The correct procedure is to backup your log on your old PC to a XML file. Then copy that XML file over to the new PC, and import the XML file into the new HRD log. The XML file contains ALL of the fields that HRD uses, including the QSL sent/received, LoTW sent/received, etc.
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73,
Roger
AC6BW