Sometimes spawning 2 creatres when the max is 1

[BLovegrove]

The section of config in question is this:

# Plains

[drop_growth]
min_pickaxe_tier = 0
biomes = [ Plains ]
prefab = BlobTar
chance = 2
min = 1
max = 1

For some reason, my server members are finding that mobs will drop doubled occasionally - 2 blobs is a lot more brutal than 1. Also theres no explanation of 'chance' anywhere on the mod pages. I get that its probably what it says on the tin but it would still be nice.

My only guess is maybe Creature Level and Loot Control is effecting them? But none of the mobs that get spawned are from CLALC.

Here's my modlist:
https://pastebin.com/GmKfZYRB