Issues after Importing DxDesigner Project to Altium

Hi everyone,

I've imported my project from DxDesigner to Altium and synchronized it. However, when updating the schematic to PCB, many components are being removed and the schematic and PCB are no longer synchronized.

Could you please assist me in resolving this issue?Please let me know what steps I need to take to resolve this issue.

Thank you for your help and support.
Somayeh