I am using:
terraincontrol-forge-2.7.2 for Forge 1.7.10 v4

I was going through my world in F3 and found this:

The biome Archipelago is not a file in the world I am using, but in BiomeBundle, another world I have on my computer. For my world config it says that Lodgepole Forest is ID 40, not Archipelago.

Did you load a BBundle world and then go to main menu and then into another world preset without restarting the client?

I believe this is a known bug that has been fixed for the 1.10.2 forge version of TC where biomes would not correctly un-register themselves when you quit to the main menu and load another preset.

This might be the case, but I cannot remember. I will do some testing and figure out if this is the problem.

This cannot be fixed unfortunately. As Minecraft uses only one biome registry, biomes "leak" to other worlds. (Back when TerrainControl was designedm before Minecraft 1.2, this was not the case.)