Every world I try to create with biome bundle is exactly the same one . Whatever i call it , whatever i do , it generates me only 1 single world . Help?

You probable just using same seed name over over.... it can be changed in configs but i do recommend third party plugin multiverse plugin then you can just simple use command mv create <normal is for normal world but it can be nether etc) -s -g for example:
mv create worldname normal -s 134314 -g OpenTerrainGenerator

Or you can just change seed name in server settings:

server.properties file you need change seed to get diffirent
level-seed=seedname

Ofcourse you need to also delete old world so that it will create new map