Entity client/server position error when colliding with modded entities?

[KirkStapff88]

Whenever i add velocity to animals on collision with my entity, the animals get pushed but then 'teleport' to their original position.

 

I don't fully understand client-server stuff so any help is appreciated.

[coolAlias]

Sounds like you are modifying position/velocity on the client side - don't do that. Non-player entities should have their velocity adjusted only on the server (and ALL entity types, players included, should only ever have their position adjusted server-side) - it will update all tracking players with the new motion automatically.