client_delete_everything API only database entries removed

When trying to delete a client using the API, function client_delete_everything, it seems that only the database entries are deleted. Databases, FTP, web path directories/files are all left on the server and have to be deleted manually (not from ispconfig panel, as they are not listed there any more).

As I know, the same function deleted everything from the system. Deleting the client from the panel works.

Will look into this soon, but someone may have an idea what is happening?