The second number after the slash (/) shows the current status of the ticket. So, RAC8/RAC2 means that when the ticket is purchased, it was the 8th such ticket under RAC category, which has moved 6 places after 6 cancellations.
A ticket's status is indicated by the second number after the slash (/), where RAC8/RAC2 implies that when purchased, it represented the 8th occurrence within the RAC category, which has been relocated 6 positions following cancellations.