Yep, they are. Many are waking up to see their item automatically changed to SD, but with incorrect postage added.
It' s a faff and a pain, but hopefully once done, the next time you come to list / relist, as your items fall under the required price / weight for Simple Delivery, ( lucky you ! 😊 ), then custom postage, after I think you need to add the price of the item, will show for you.
Happy Selling ! 🤗
@beenz60