LrC suddenly creates new / double photo folder after import

I have just fished updating LrC in connection wtih buying a new Mac mini. After the update I imported a folder with photos but they appear in a new "photo" folder. 

I have attached a screenshot with the new folder and subfolder above the "old" just containing a test 

folder

I have all my photos on a shared network drive on a Synology NAS - the shared drive is the "parent folder" for all my subfolders. When I reveal in finder both the "new" and the "old" shared drive points to the same shared drive in finder. The same applies regarding single photos.

Why does LrC see 2 versions of the same shared drive and why does it suddenly decide to link new imports to the "new" shared drive? .... and does anyone have a solution to solve the problem?

Thanks in advance

Carsten - Denmark