Not fire Overlap/Hit Event When Player Not Moving

I have a actor with a SkeletalMeshComponent, it just play a simple animation, when my charactor moving, it is correct, overlap/hit event fired between them, but when my charactor just stand still the actor play animation, nothing happen when they contact, they overlay each other without fire event, then I slightly move my charactor, overlap/hit event work again, my charactor pushed away. as I know, these question exsist since UE3.

Make sure you have checked the box “Generate Overlap Events” or “Simulation generates hit events” in the collision section of the Mesh.