The reason for this is you have not asked for the site upgrade to be fixed. You have instead requested your site is restored to an earlier point in time prior to the backup. That can take some time, and may be a few days it some instances, as this is not something caused by the core platform. This is rather something caused by a 3rd party application.
If you are just looking to get your site back online, we may be able to remove that item from the upgrade process and go from there. Would you like us to see if we can do that for you?