Biomes O' Plenty biomes switched up

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    I've been playing with my friends on a modded server with Biomes O' Plenty for a while now, but when i logged on today, the biomed in the world were completely switched up. Our base used to be in a woodlands biome, now we're in a rainforest, and all the other biomes have also gotten all mixed up all over the place. None of the biomes that were here before are the same, how does that happen? I haven't messed with the seed or the world settings at all, so I'm curious as to how this happened and if there's any way to reset the biomes and only the biomes while keeping everything else the same.