Mod version: lostcities-1.12-2.0.4
The biome "river" is shifted away from the river basin when using lostcities_bop worldtype (see screenshoots)

That's not something my mod is doing

But this happens only on your lostcities_bop level-type 💡

Still not something I have control over. I don't handle biomes

(sorry to post this here as a starting point, trying to find why this is, without opening a new issue)
I got this too, easily visible in the middle desert of my rendered map

Could it be a BiomesOPlenty issue? in which case I could open an issue there referencing this one
I got a couple of mods adding biomes, namely BoP, AbyssalCraft, Evilcraft, RandomThings and NetherEx
Unless it's a Customized Preset World thing?, I use https://pastebin.com/vqy5e0cp , which have BiomeSize = 3

The problem is relevant. I think the problem is with the BiomeProvider and ChunkGenerator of mod Lost Cities.

Maybe this fix shfting rivers?
https://github.com/Glitchfiend/BiomesOPlenty/blob/a9e42935d0d3ae4cd9c915854045826307633b3d/src/main/java/biomesoplenty/common/world/ChunkGeneratorOverworldBOP.java#L352