Edit:

There was an edit of the comment indicating that there is perhaps really a bug in bookmark-dupes (although so far, I was not able to produce the described problem in any testing and had no other such report.)

Since I had switched off localization of bookmarkdupes' webpage (due to various problems) it seems that all related edits of this discussion got lost.

For reasons like this, this is not a good medium for communication about a bug.

Therefore, I opened https://github.com/vaeth/bookmarkdupes/issues/22 (but if you prefer we can also discuss instead by email).

Translations are always welcome, of course. (Preferably by a pull request on github, but if you are not familiar with git, drop me a note and we will find another way.)