@MegaWhimsicott Sometime after, Grian and Mumbo meet up for some trade or something, and instantly everything feels right despite only taking the time to get to know each other for a few minutes. This continues for the rest of the Hermits, finding their groups they stick with in canon and feeling the wrongness from before disappear.
And again, it's brought up in a meeting. They soon decide it would be a good idea to research about it so they go to a library in the main hub to look for anything about how they've been feeling. The only thing they find is a book about alternate universes, which doesn't cover anything about their issue.
I'm not sure where the plot would go on from here, but I think there would be some being who had been watching them (not the Watchers, I don't think they would work for this). I wouldn't make them an antagonist, but they wouldn't know about the being until Doc almost has an outburst but the feelings of anger are seemingly sucked out of him.
The being would be what was changing the events of their pasts to make the Hermits happy, and draining any bad feeling away to trap the Hermits in eternal happiness.
The being watching them might be a Hermit from an alternate universe, just hoping for happiness, but they don't realise the harm in doing what they were until someone, let's say Mumbo, ends up pushing against the removal of bad emotions, and eventually gets confronted.
The story would end with the Hermits remembering (is it remembering if it never happened?) what originally happened in their pasts.
Not sure if I'll write this but if anyone wants to, tag me cause I want to see how you write it. Wow, this was longer than I expected.