There is a two-step solution to this issue:
Upgrade SymmetricDS to the latest 3.15.x version, since there were many fixes related to interrogating database objects in both 3.14.x and 3.15.x
Download: https://symmetricds.sourceforge.net/
See also: https://issues.symmetricds.org/changelog_page.php
If that does not help on it's own, add a new Transform for loading target table. This allows you to specify table name to match database engine exactly.
https://symmetricds.sourceforge.net/doc/3.15/html/user-guide.html#\_transforms
Get exact table name by querying system objects: Get list of all tables in Oracle?