Thanks for the file, Bun-H.
Selected all the Dynamic tags from the list under the “LANE” Null object. All four at the same time.
Then go to: Attribute Manager>> Collision> Shape: Set it to “Static Mesh”.
Press play. On sphere will get lost as the Tube is too short, move it. the time will not be sufficient, so extend it.
Then you should see a full “cycle of action”.
The standard Shape is more like an egg around the whole object, as you have seen it in the initial set up. It creates a simplified calculation and is preferable in most “mass” scenes. But if the shape of the objects matters and is not given with any other option, use this or even the Moving Mesh. Note that a sphere is perfectly fine with the default.
All the best