Hi Timir, the way the PDF importer works is every time a path is rendered it will make that path into a curve inside MoI. The thing is there are 2 different ways a path can be rendered in PDF, it can have its outlined drawn or it can be filled. So if a path has both an outline and a fill you can get it duplicated.

One method you might try is the RemoveDuplicates command. There isn't a button for this in the UI so to run it select all the curves, type the Tab key and type RemoveDuplicates and then Enter.

- Michael