Odd terrain Generation on 1.2.5

I'm getting some odd land generation between the borders of terrain types on 1.2.5.
Plugin list:

Screenshot:
http://i.imgur.com/iRI7p.jpg

Any ideas on a solution to this?

Shameless bump.

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

Your amap might have been corrupted. Has it been snowing or having different weather in places it did not before? What it is, the seed is not your original one anymore so it's rendering a different seed.

 

I've verified that level.dat contains the correct seed number, as does multiverse. Odd. Looking into it further.

 

Well, I am no expert but if you tell me the seed I'll see what I can.... see.

 

Was this world started in version 1.2 or is it from a previous version of minecraft?

 

It was converted from a previous version of Minecraft.