If this was a bug in Hogfather, it would have been requested several times by other users. But it was not. There must be a difference to Hogfather in your DokuWiki that is causing this bug.
What about the template? Does the bug occur with DokuWiki's default template? Are you using a template from 2008?
You have made a very big jump. Maybe you should completely rebuild the wiki to make sure all the old leftovers are gone. You should also keep in mind that there might be other bugs that are not so directly visible
- Michael Sy.