Image appears sometimes

The image appears in Mailchimp “some times”. And I go back to the site and clear the cache and it returns some times. It’s hosted on Bluehost. I disabled Cloudflare. I created my own image size and used the custom function, regenerated thumbnails and yet, the image appears in Mailchimp – some times and not all. Is this a caching issue and if so, on the hosting side, plugin side? Site is on WP 6.4.3 and PHP 8.2.16. Thanks in advance.