Amcor Chess Depository Interests

Hi. Amcor CDIs are listed on the ASX. Amcor Plc is domiciled in the Chanel Isles, Jersey I think. It pays a dividend quarterly, denominated in USD, but converted to AUD. However Navexa applies a US withholding tax to this security. I don’t think that is correct: distribution statements don’t mention a withholding tax. And there is no annual statement to suggest such a tax. As the company domiciles in Jersey, UK it seems incongruous. Any information on this ? I think it’s a bug, but am happy to be corrected. Thanks.