The Dataset Group name and Container name are different.
The data container in the GUI is visible only on the url -- http://<delphix_ip>/Server.html...
You may need to select any one of the dsource/vdb from any groups and the same would be visible. Depending on the source type, whether it is MSSQL or Oracle, the type is displayed with a unique id. This is just a mapping to the database. Hope it helps!!