I think you found the bug adressed in this commit:
On Mon, Nov 13, 2017 at 7:19 PM Christoph Held <kreisleri...@icloud.com>
> Thanks both
> I just spent some time looking at those zombies and it turns out that
> virtually all of them are the result of page renames. Although the box
> “update x pages linking to this page” was checked, this appears to have
> been unsuccessful in some cases. Particularly pages with implied page names
> and positions (i.e. link target typed into text) are stubborn.
> Of course, inspecting the backlink and correcting the syntax is a little
> tedious but gets rid of the zombies effectively, thanks for the reminder,
> everything looks a lot better now.
> > On 13. Nov 2017, at 15:43, SultansOfSwing <sultansofsw...@web.de> wrote:
> > Hello,
> > I'd suspect these 'ghost entries' correspond to some text you have
> > entered recently. It is one of Zim's powers to turn any words looking
> > like page addresses (starting with a plus, or containing a colon) into
> > links which you can immediately click to create the page you have
> > 'mentioned'. And as long as you don't click on it, these pages appear
> > greyed out in the index.
> > As I very often write about computer names and ports, delimited by
> > colon, I got used to the habit to mark the link (you recognize it
> > immediately by its blue color) and press Ctrl+9 for "clear all
> > formatting". At the next save (or autosave) the ghost entry goes away.
> > Regards,
> > SultansOfSwing.
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