Sync webdav on new device

I used webdav to synchronize on both PC and mobile devices, and it was proven to be successful. However, when I tried to synchronize on a new PC, I found that it was blank and not synchronized, but it showed that the synchronization was successful. What should I do?
https://s3.amazonaws.com/zotero.org/images/forums/u16618992/edpv1k6ylhiaj9wrfjix.png
https://s3.amazonaws.com/zotero.org/images/forums/u16618992/oczx9c0fp9xc9dtarop2.png
https://s3.amazonaws.com/zotero.org/images/forums/u16618992/hauhy5iebsng9ydy9jir.png
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