I don't think its the double level-up. I too did it sometimes. I enven did 5 levle-ups in one of my last parties (from level 11 to 16). I never encountered such a thing.
My guess is that the game not only checks your level, but also your skills. If you have higher skills, the enemies get stronger. I case of a well-trained solo character, this might lead to strange results.
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