In the most recent version of Biomes O Plenty there is a Biomes Spawning issue, I removed ALL but one vanila Biome and Biomes O Plenty insists on spawning other Biomes, If i only want 10 biomes to spawn, Then it does not spawn any of them. This is a plauge in the last few versions of Biomes O Plenty.

This isn't a bug, it's a feature which hasn't been added yet. We don't have an option for disabling Vanilla biomes, only our variants which override them. #250 is the issue referencing the feature.