I have a property setup that has two main views: sitea.com view and siteb.com view, note that the property default URL is sitea.com.
When I go to the reporting tab for the siteb.com view, and navigate to Acquisition > Social > Landing pages, the shared URL shows both sitea.com results and siteb.com results despite me being in the siteb.com view.
I added a custom filter that filters out sitea.com but when I verified the filter it says that it doesn't have an effect, and when I check the report the site that is excluded still appears in the results.
Picture of results & filter: https://i.sstatic.net/whdgy.jpg