ttrss allows to organise feeds in categories. Liferea ignores them and shows all feeds directly under "Tiny Tiny RSS".
The expected behaviour would be, that liferea shows the categories as folders (as it is done with the google reader source).
liferea: git commit e4020f4fd2371cb7a29a1a6dec1323e9d08e1b47
ttrss: git commit 496195db4e59e1a2a59ca190450a3b140e44f4a7