In JIRA Portfolio, I'll put in an estimate of "54" points for an epic for example. I'll then link to JIRA and create an epic ticket. Then, stories will be created in JIRA and assigned point values. If the total of those tickets is 54 points, it now matches the epic value (which was assigned 54 points during planning). When I update from plan, Portfolio now changes the estimate to 108 instead of keeping it at 54. It appears it's counting the epic value and adding the sum of the stories within that a value.
My assumption is it would would rise if the sum of the stories was higher than 54 points, and fall below 54 points, if the sum of the stories was less.
Help? Thanks!