>>8903760
NovelAI seems to train by scrapping sites like danbooru and gelbooru. If you search Magnolia + Marin in gelbooru, you will see that people have uploaded all the variants of the first part, so the model has overtrainned that pose and will default to it because that's what it has been trained with multiple examples that those two tags together always result in the same pose.
I guess if people upload the second part, when NovelAI does another training round it will result in more variety as it will now have two reference posses.