Dh loading chunk way bellow than where they are supose to be

i have some question abt the generation settings. So my problem is that distant horrizon is loading my chunk way bellow than they are supose to be. On the image up there you can see 3 floating island which are also loaded by distant horrizon. The true ground level is where you can see plenty of unique chunk next to each other. I think the problem is i am using a height limit remover mod but what i dont understand is why some chunk load at the right height but the majority dont. Also im sorry if im not talking very clear im not fluent english speaker. Im in 1.20.1 with the last nightly