I have a large portfolio plan with over a dozen teams and about 15 initiatives. I set custom sprints for each team because they each have their own sprint schedules and sprint names. I set them as fixed and included the start and end dates. I only included forward sprints from the time I set up the plan.
Now whenever the plan recalculates, some of the stories are assigned to sprints that are in the past, even when the status is in Backlog and they're not estimated. This makes the plan look much more optimistic than I should. I've been fixing those manually but it's a lot of tedium. Am I doing something wrong or is this a bug? Should I be deleting the custom sprints after they are closed?