Can't create share from restored folder

 I already solved ths now but still like to understand what happened:

I have basically 7 computers that attach to my NAS (named NAS4 in my network). To make the discussion simple I will explain the difference between my personal 2 mac's. (One macbook pro retina and one 27" Imac) both are on exactly the same verion of Osx. When navigating in finder to <shared>/all/NAS4 it wil show me:

admin

data

Documents

home

Music

Pictures

Videos

(the Imac will not show: admin and data!) and it doesn't matter wether i use SMB or AFP.

if i navigate to the data folder on the macbook pro it will show me everything except data and admin.

The things that are shown in the data folder are the same forders that I can see if I navigate directly to the NAS4 on the Imac.

So I copied the 2 backed-up folders, incluyding all underlying files, to the data folder.

These are now visible if I navigate to the data folder (only when using the macbook) but are not visible if I navigate to the root of NAS4 in the finder. (I know this is not actually the root but this is what it looks like in finder)

In the web admin page these folders are not visible.

I managed to rename the folders on the macbook, created new shares in the webinterface and used the webinterface to move the files. Now the new shares are visible.

The strange thing is: why is the data folder including created subfolders and the admin folder visible on one computer and not on the other? I have tried to connect to the "data" root on the other computers without success but on the Macbook (and also one one old PC) the data directly simply shows up in explorer/finder and accessible without problems.  Looks like there is some kind of hidden/system attribute that is completely ignored by 2 of my computers.