Congratulations for a successful inquiry and lots of thanks for explaining at last how "Policepardfaut" came to infest silently the odt files in their xml innards before blooming later in the EPUB as multiple "Policepardfaut" spans.
Of course I already use a saved search to discard these pesky spans. This is easy, but finding the reason was quite tricky.
BTW, I also use ODTImport and people at ELG will be happy to see that there is at least a Danish reader.Just hope you are not alone.
Conclusion: A warning to odt users of Word 2013
So, it seems this thread finally reached a successful conclusion as all the questions which have been asked for have found, if not a perfect solution, at least an explanation and a workaround.
odt users of Word 2013 (2016?), should be ready to correct two Word induced defects appearing on their EPUB after conversion of their odt file:
1. - you'll have to correct the
relative width of images and (maybe) suppress an empty paragraph
2. - you'll have to use a regex to suppress the
useless and empty "Policepardfaut" spans.
As regard other points
- if a letter-spacing property appears in your body, check the kerning font setting in Word 2013
(credits to BetterRed)
- if some heading, titles, or notes change, attach a customized .dotm model to your file.