I just have a quick question. Is there a population cap for this game?

I just collected the last magical fish, which completes my magic makers collection. Completing this is supposed to increase my population by 5, but it didn't. I should have gone from 36 to 41, but I still have a max population of 36.
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From the Darkness she comes, the light shows no form, yet tranquility proceeds, the accursed Storm...