From @JetstormLP :
http://www.minecraftforum.net/forums/mapping-and-modding/minecraft-mods/2524489-realistic-terrain-generation-rtg-realistic-biomes?comment=3471

Possible surfacing issues still. http://imgur.com/a/DCzPQ

first image is a strip of beach, second image is beach/gravel beach - might be trying to make a scenic lake? third image the sand and all exposed stone is all beach.

all of them are right by each other. x -976 z -52 , x -1024 z 40 , x -1136 z 76

Seed: -5179197818664533290

FML-client-latest - https://www.dropbox.com/s/t69tbua8s177gzy/fml-client-latest.log

OP has been unable to reproduce this using the latest snapshot:

http://www.minecraftforum.net/forums/mapping-and-modding/minecraft-mods/2524489-realistic-terrain-generation-rtg-realistic-biomes?comment=3553

I haven't seen it in my recent testing either, so I'm closing this.