MySQL Cluster -- Storing table data on data nodes
everything is in order! 

 The data nodes don't have individual files for each table and so you won't see the table names there. What you're seeing with the MySQL Server directories is not the files containing the contents of the tables but a copy of the data dictionary/schema definitions for those tables (e.g. if you add more rows to these tables then the files you see with the data nodes should increase in size but the ones with the MySQL Servers should not).

Regards, Andrew.