Duplicate skatter objects

Skatter General
1

When I create Skatter setup everything works pretty much fine. But when I go to render list and select the same setup all the skatter objects in the list are duplicated. I am not sure if this having some effect in performance but at least it makes it more when editing the setup (delete object). Is this a bug or something?

For example the skatter object list becomes:
Birch 12m
Birch 14m

Birch 12m
Birch 12m#1
Birch 14m
Birch 14m#1

2

Could you send me a file where it happened?
Leave the Skatter setups in the file.

Thanks