V10 Export to EMLs can produce bogus duplicates!

Working on my local folder

exporte as EMLs reports the same number of messages

but produces 100 more EML files:

Inspecting the files finds many duplicates e.g.

The two files contain the same message, which occurs only once in the folders message list:

image

Any thoughts?

eMC 10.1.4588, Windows 7