Application list in manage pages are always checked when we select type as panel.
1. Go to manage pages, and create a page with type Panel.
2. you can see that all Applications are selected by default.
3. Select the Applications you want.
4. save the changes.
5. changes are saved but if you see the list. it will again show all the applications selected.
It should only show the selected application checked after saving
Liferay version 5.2.2