The animation Blueprint of Manny and Quinn in UE5 (ABP_Manny) refers not only to its velocity but also to its acceleration when playing animations (the behavior is different from UE4 Grayman.)
Strix Movement Synchronizer doesn’t synchronize acceleration, so the movement animation may not be synchronized from the original to replicas. You could remove the acceleration checking from the animation Blueprint to make the animations synchronized, though it changes the behaviors of the mannequins slightly.