Hallow biome not showing as Hallow in the part that is next to the Crimson.

[MisterMan99]

For some reason at this exact spot my Hallow biome just turns into forest and then turns into Crimson once it hits my hellavator split between the biome and I am not sure why this is the case as there are enough hallow blocks in the area so I really am not sure whats going on. Any help or explanations would be greatly appreciated.

 

[Dragonlord]

I believe the background/music basically has a hallow/evil balance meter in it, and that spot must have just enough crimson around to roughly equal the hallow, so you get temporary forest sound/background.