minimserver 2.2-7001 sees only the first subfolder I installed under Music folder

[Manelus]

I have just installed minimserver (2.2-7001) on my new Sinology 1821+ to replace my old Qnap.
I first installed minimserver with just a folder with a few files on it (under Music shared folder) to test, and it worked fine, then I copied my entire collection on the same Music shared folder.
But to my surprise, when I rescan minimserver and it only sees and rescan the first one I installed.
Any change under that first subfolder is rescanned fine, but nothing outside it.
minimserver is pointed to Music folder, but it only sees the first subfolder I copied, not the other subfolders I copiet afterwards.
I have uninstalled and installed minimserver, rebooted … nothing is working.

Please help! I ran out of ideas.