Backups for a container or a virtual machine were deleted manually, but they are still listed in the Virtual Automation Management Node web-interface.
The full list of backups, available on the local server, is generated and sent to VA Management Node at the moment of VA Agent service startup.
Additionally, the per-container backup list is refreshed on a subsequent backup operation with the container.
Restart VA Agent service:
~# pvaagent restart
net stop pvaagent && net start pvaagent
After few minutes changes will be reflected in VA MN web-interface.