If a Change ticket is placed on hold after voting has been started any votes that are performed while the ticket is still on hold is lost and will have a status of Has Not Voted.
The Change ticket data isn't refreshed to include the updated voting status after it is removed from hold before the next save is performed.
Symantec Development has reviewed this issue and made a point fix available.
The point fix can be found in TECH212326, along with all other point fixes for ServiceDesk 7.5 Service Pack 1.
ServiceDesk 7.5 Service Pack 1