Marketpress "delete_store_order" permission not working as expected


I'm running Marketpress and I would like to prevent users with a certain role from deleting any orders. As you can see from the attached screenshot, this role has none of the delete*orders boxes checked. This is the only role granted to the user in question. However, Marketpress is still allowing them to delete orders. Please advise as to what I'm doing wrong and how I can fix this so it works as expected. I really appreciate your help.