Updated server and biomes are bad, need help

[lpqrimetime]

I updated my multicraft server which runs FTB Unleashed. And the biomes were chopped up. Some have giant flat walls where it cut off a mountain and made a new biome. What caused it is what i would like to know so it doesnt happen again.

When i updated my server i saved the world folder, which i believe i named FTB world. Then i wiped the server and uploaded the new server files and put my world back in. It saved everything fine, but flying out a bit i see chopped up biomes, and some places where water is messed up.

also torches are floating, so what happened?

 

[Bibble]

The world is generated based on the seed, and the generator. In this case, the generator changed, so it no longer had the same biomes where it thought it should. If you're upgrading versions, there's not much you can do about it, it happens between vanilla versions, too.

 

[lpqrimetime]

All the biomes remained the same though except a few got chopped. So i dunno if it was something in the way bioomes o plenty calculated the seed, which remained the same?

And does that mean we basically won't be able to update the servers if they are going to just change?

 

[Bomb Bloke]

Indeed, if you don't like it, don't update the server running that world.