I would look myself, but I am not that far yet in the new content (had to start over ... a few times), so just to make sure: They
do give their negative +2 Corruption each, aye? Because if not, they may indeed just be placeholders (or switches for new dialogues), and only the effects will be implemented later. Which would admittedly be strange, but possible.
If they give their negative effects, though, and we will not go with either the 'Time Travel!' or the 'You, my man, have been cursed by Odin's Wrath' theory (a shame, really), it sure seems like another bug.
Or the developers deliberately put the negative consequences in, but postponed the positive ones. Which would make them quite the jerks.