after digging this problem i founmd that removing the latest galaxyspace (1.1.8) it solves the issue if you need data of any kind tell me

when i create a world with 1.1.8 the oceans don't generate but instead moshroom islands
doesn't happen with 1.1.7

tried with galacticraft 501 and 502 for MC 1.7.10

in Overworld?

Wondering, you use ONLY galacticraft and Galaxyspace? Or some extra biomes mod like Biomes o plenty?

i used BOP but removed it because it crashed yes it is in the OW and using galaxy space 1.1.7 instead of 1.1.8 solved it the only biomes added by mods are the oil biomes by buildcraft i think

Check you biomes id in configs. They must not coincide.