Synchronisation Issues

Dear VillaTheme Team,

We are using your ALD plugin and are generally very satisfied with it. However, I have noticed that the synchronization does not work as expected for some products. In some cases, the supplier on AliExpress is no longer available, but the product is still displayed as in stock on our end. Conversely, the problem also occurs: the product is available on AliExpress, but it is displayed as out of stock on our site. What is the correct procedure when individual products are not synchronized? Has this issue occurred before, and if so, what should we check? Thank you very much.
Ernesto