Dropshipping everspring app synchronization does not run well from stock

Dear,

Who can help me with this. Contacting shopify itself simply does not work.

I have added a dropshipping supplier called everspring.
Everything is entered properly and also the app is installed properly.
everspring has checked the products what i have forwarded. and still the products are on sold out. the synchronization of the stock is not running properly.

What can I do?

Thanks in advance

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Thank you for your support and verry fast answer. I Will try this is all first. Thank you!