Custom dimesnion is the same in every world

I'm working on a dimension mod but I've noticed that every world I make to test it, has the exact same layout every time I make a new world. The scructures and biomes are in the same places in between each world. I'm using end like gen and I'm guessing that's the problem but I'm not totally sure. I'm fairly certain it was working fine before I updated to 2021.1 since I didn't notice anything being the same but it might have been an issue in 2020.5 as well. If anyone has a fix for this, or at least knows how to manipulate the location of the biomes, help me out please.

I'm using 2021.1 and here are the settings. There is no portal and there are no triggers.