Minecraft world forge 1.20.1, mod version 1.6.4.
Umvuthana's spawned from spawner will immediately start travel to coordinates 0 ~ 0, but maybe it's to the center of the world border, I'm not sure because on the map I was making I put the center at 0 ~ 0. When they reach around 0 ~ 0 they start to mindless go around and return to the center. It's a strange behavior.

This is likely because they don't have their village position set, so it defaults to 0,0,0. Then they try to go home.

You can set their home position in their NBT data. But you're spawning them with spawner blocks?