I believe @Anonymous and @Cameron are correct, I've had a similar issue for the same reason. If your site/page is no wordpress just make sure you set a featured image, this will solve your issue.
If you are unsure whether the image will pull or if you are reposting a page that you know in the past hasn't pulled the image you can manually add the image within the HubSpot post scheduler. Just click the little picture icon in the bottom left of the scheduled post. This should solve your issue.
I want to share with you this article which could help. If you're still having the issue, I would recommend connecting with HubSpot Technical Support, as Support is included in your subscription and they will be able to provide real-time assistance for this matter, where you are able to share screenshots and further specific example about this.
I believe @Anonymous and @Cameron are correct, I've had a similar issue for the same reason. If your site/page is no wordpress just make sure you set a featured image, this will solve your issue.
If you are unsure whether the image will pull or if you are reposting a page that you know in the past hasn't pulled the image you can manually add the image within the HubSpot post scheduler. Just click the little picture icon in the bottom left of the scheduled post. This should solve your issue.