I have played this on macOS and have reached Maximum Affinity with all the characters, I have found 50% of all the Sniffets but the remaining ones have a Question ? mark next to them in my characters profile.

I have also completed all the available quests including defeating the cursed king and defeating the dragon. 

There seems to be no more quests to finish and I have declared my love to all of the available characters.

I have read the Sniffets Location Guide and followed all the instructions to the letter, but still 50% of the Sniffets are unavailable.

I have done everything I can possibly think of, but 50% of those Sniffets are simply not available to collect.

What do I need to do to get all the remaining Sniffets.