Are the tables being created in the rl_test schema? The default tablespace is tied ultimately to the schema owner - not the user creating the table - when that user has authority to create a table within any schema ('create any table').
Ultimately, the owner of the table is the schema owner. There may be no ties to the user account which created the object.
Are you sure that the table was created within the RL_TEST schema? Try logging in as RL_TEST and issuing:
SQL> select table_name, tablespace_name
2 from user_tables;
If RL_TS is actually not the tablespace being used, and RL_TS is the default tablespace for RL_TEST, then I'd be suspicious that the tool you're using might be setting the tablespace behind the scenes for you (by submitting DDL like marist89 posted).