Underlined text has some additional white space before it when export to PDF

The following text:

When exported to PDF, this text should have no white space between the double quotes and the xxx: "_xxx_"

Shows up in PDF as:

When exported to PDF, this text should have no white space between the double quotes and the xxx: " _xxx_"

This does not happened when viewed in HTML.

It seems some extra carraige return is between the " and the <ins> tag which seems to be understood as a white space by the PDF export.