Hi,
Agree with learn2skills, we could using the following ways to troubleshoot this issue:
1.Reset WSUS server "wsusutil /reset" then re-sync.
2. Open the WSUS console from Server Manager and navigate to the Options area.
Select the Server Cleanup Wizard, Run the Server Cleanup Wizard.
3.Decline those updates, then re-approve them.
4.Please check the "download status" in WSUS console:
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