I have a cloud page which renders a contenblock as shown below and 
 is set to work only with HTTPS (*the option chosen during the building of the cloud page*)

    %%[
    VAR @contentBlockID
    set @contentBlockID = "4179901"
    ]%%
    
    %%=ContentBlockByID(@contentBlockID)=%%


This HTML content block has an image and some text as shown below

        <span style="font-size:12pt">
          
        <p>
          <br>
          Thanks for your response.
          <br>
               
        <br>
        </span>
        <table width="100%" cellspacing="0" cellpadding="0" role="presentation">
    <tr>
    <td align="left">
    <img data-assetid="408384" src="http://image.xyz.com.au/lib/fe8c13727650017573/m/4/f7a93aac-4287-4f97-bc72-788955e57145.png" alt="" height="51" width="150" style="display: block; padding: 0px; text-align: left; height: 51px; width: 150px; border: 0px;">
    </td>
    </tr>
    </table>
        <br>
        <br>
        <span style="font-size:11pt"><span style="background:white"><span style="line-height:115%"><span style="font-family:Arial,sans-serif"><b><span lang="EN-GB" style="font-size:10.0pt"><span style="line-height:115%"><span style="color:#492365">T. </span></span></span></b><span lang="EN-GB" style="font-size:10.0pt"><span style="line-height:115%"><span style="color:#666666">1300 300 300</span></span></span></span></span></span></span><br>
        <span style="font-size:11pt"><span style="background:white"><span style="line-height:115%"><span style="font-family:Arial,sans-serif"><b><span lang="EN-GB" style="font-size:10.0pt"><span style="line-height:115%"><span style="color:#492365">E.</span></span></span></b> <span lang="EN-GB" style="color:black"><a href="mailto:[email protected]"><span style="font-size:10.0pt"><span style="line-height:115%"><span style="color:#1155cc">[email protected]</span></span></span></a></span> &nbsp;&nbsp;</span></span></span></span><br>
        <span style="font-size:11pt"><span style="background:white"><span style="line-height:115%"><span style="font-family:Arial,sans-serif"><b><span lang="EN-GB" style="font-size:10.0pt"><span style="line-height:115%"><span style="color:#492365">W.</span></span></span></b> <span lang="EN-GB" style="color:black"><a href="http://www.xyz.com.au/"><span style="font-size:10.0pt"><span style="line-height:115%"><span style="color:#1155cc">www.xyz.com.au</span></span></span></a></span></span></span></span></span><br>
        &nbsp;

When it actually renders though, the image looks broken as shown in the screenshot below

[![enter image description here][1]][1]

When I did an inspect and copied the element, I observe that the image is sourced from "http" version of our website instead of "https" as shown below

    <img data-assetid="408384" src="http://image.xyz.com.au/lib/fe8c13727650017573/m/4/f7a93aac-4287-4f97-bc72-788955e57145.png" alt="" height="51" width="150" style="display: block; padding: 0px; text-align: left; height: 51px; width: 150px; border: 0px;">


This image was uploaded as an asset in content builder and I would like to know why this upload went as "http" upload.

How do we fix this so that the image appears in the cloudpage ?

  [1]: https://i.sstatic.net/iBX0e.png