All the image show weird generation of water features and these come from all 3 dimensions, there are no other mods than the latest prehistoric fauna version (prehistoric_fauna-2.3.2) and the forge world itself (1.20.1-forge-47.4.0) for the Jurassic and cretaceous rivers there are pockets that can go from a block deep to about 6 or 7 and in the Jurassic I found these weird bubbles of water as seen in the pictures. In the Triassic the land and edge of the water were at different levels making almost a wall.

update*
I am still having the same finds, could this be something on my end?