I took a look at the orders an it looks like the orders don’t have a fulfillment which is why they’re not showing in the Orders section of the Seller Dashboard. Only orders that have been fully paid for and have a fulfillment will show in the orders section.
The webhooks should still be working. I did check the webhooks logs and all the events seem to be returning a 410 which means gone. If you send a test event do you get a 2xx?
As for the sync issue you’ll need to export the CSV and re-import it to sync all the items. 