Unix SMP World Generation Hickups

[Londran]

Hello Guys,

I already wrote this in the Helpdesk as a ticket, but the ticket disappeared. So I decided to write the problem here.

System: Debian 6 on a Strato Virtual Server (32 Bit)
Java:
java version "1.7.0_17"
Java(TM) SE Runtime Environment (build 1.7.0_17-b02)
Java HotSpot(TM) Server VM (build 23.7-b01, mixed mode)

FTB-Laucher: 1.2.2
Modpack: Ultimate

Problem:

World generation gets messed up on some Chunks. E.G. Some Pillars on Oceans
Seeds are used different by SSP and the Server.

I made Screenshots, to explain the thing better:

 

[Hobby boy]

That's a Marsh Biome, which is added by ExtraBiomesXL

 

[Bickers]

just disable marsh generation in extrabiomes config