There are some Input TS alarms which don't link to any multicast group on input side. Multicast group has already been removed and there is no TS under input tree.
Right click the port and check setting, it includes two lists. One is for input TS, the other is for input Service.
The TS has been removed from first list, however there are still some services left in the 2nd list.
When clicking delete icon to remove those services, it generates warning message, these services are not linked to any TS:
Refresh the page, the service should be removed from the list.
After removing dummy service from list and refresh page, the cosmetic alarm is disappeared.