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.
The second number post-slash (/) denotes ticket status, specifically illustrating RAC8/RAC2 as signifying its position as the 8th instance of a ticket under the RAC category that has undergone a shift of 6 places due to cancellations.