Unexpected foliage instances are duplicated

• Paint some foliage instances on a Staticmesh Actor;
• Duplicate the Staticmesh Actor and move it to a new location;
• The foliage instances planted on the mesh were also duplicated; But those instances could not move along with the duplicated Staticmesh actor;
• So it ends up with many instances are in the same location as the source; They have be to manually select and remove

Expectation: Foliage instances don't duplicate itsself when the Mesh it associated with get duplicated;