To remove your items from Facebook, you need to go into Listings. Select the items you would like removed, scroll to the bottom of the page and select either:
A) "Delete Selected Photos from Facebook". (This will allow you to choose which party you would like your items removed from WITHOUT removing them from other sales. They will remain in your listings.)
B) "Cancel Selected" (This will remove your photos from all of your parties and will move them from My Listings into your Inventory.)
Items that were sold are no longer on your Listings page, they are on your Sales page. So when you tell Sonlet to remove your items from Listings, those items are not being pulled down.
You need to go into your Sales page and "Delete Selected Photos from Facebook" to get them to come down as well.