Erebus came out for 1.7.10 recently, and with that, I am finding biomes from Erebus that should not spawn in the overworld, spawn in the overworld. I changed my ids for them and all that, but, I'm still finding Erebus biomes in the overworld.

Thanks for making me realize that a new version of Erebus is out! =D
I can verify Erebus biomes generating in the overworld for BOP .992 - biome IDs are duplicate.
If you have reassigned biome IDs, are you absolutely sure you have not overwritten other already existing biome IDs like the vanilla ones? For reference, those are the vanilla biome IDs: http://minecraft.gamepedia.com/Data_values#Biome_IDs
Cause after reassigning the Erebus biome IDs I have not been able to reproduce this issue; flew around for 10+ minutes in a tiny biomes world without finding any Erebus biomes spawning.

Oh, and what version of BOP are you using? Putting basic information like that in an issue report could prove extremely useful I guess, in this case especially as vanilla Minecraft screws up sub-biome placement in 1.7.10 and this has been fixed by BOP only in version .989 and above.

http://pastebin.com/qThhmh22 Here is my current biome dump.

I'm sorry, but I won't sort this out for you, especially as I am just another normal BOP user.
How am I even supposed to see if biome IDs are conflicting here? You've got a ton of biome-mods installed, amongst others also ExtrabiomesXL in addition to BOP.

On top of that you still haven't answered the basic and very important question of what version of BOP you are using.
I would have to sort out which mods you have installed, set up my own instance with those mods, then go through all the config files for you, all the while wildly guessing what versions of the mods you are actually using.

Two suggestions:

• If you are using a BOP version with a version number below .989 just update to the newest version, as that might be the issue here which in turn might get solved by updating.
• If you are already using a recent BOP version then set up your biome mods from the ground up, keeping track of the biome IDs to make sure none overlap.

In any way I am almost sure that this is not an issue with BOP but instead an issue with your configuration.

I am using the latest version.