Having same problem on my end. Here are steps to replicate: Place any static mesh in scene, check boxes for ‘Simulate Physics’ and ‘Static Mesh Replicate Movement’, now play with 2 players. mesh should land in same spot for all players regardless of where you put it, like in sky. Now create an actor, add a cube component, set ‘Simulate Physics’ to be true, and set ‘Replicates’ and ‘Replicate Movement’ to be true on Actor(self), now drag actor into scene, and play with 2 players. actor will almost always end up in a different location for 2 players.