From what I'm understanding,
The Root Cause:
AliExpress (like many large sites) restricts hotlinking, which means you cannot reliably serve their images directly on your site by linking to the image URL hosted on their CDN (e.g., ae01.alicdn.com/...). They detect this via the referer header...
Go to Wordpress Settings > General and check to make sure both urls are listed as https: If they say http: simply insert the s in both and save changes, You will then have to log back into your account. That should fix it.