So I started a new world, and for some reason the kitty mob is spawning in every biome, including the middle of the ocean

I have no idea what could be causing it, but here's my config for the kitty and as you see it should only be spawning in Plains and Forests.

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kitty

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kitty {
S:biomeTypes=[PLAINS, FOREST]
S:blockedBiomeTypes=[]
B:canSpawn=true
S:dimensions=[0]
I:frequency=8
I:maxSpawn=2
I:minSpawn=1
}

Most likely related to #2, see if setting KittyVillageChance to 0 in MoCSettings.cfg stops this from happening.