Our tweets about our blog aren't pulling the main image



When we tweet about our blog and include the link to the blog, it’s auto creating the blog card in the tweet but the image isn’t always pulling from our blog.
The issue is, it doesn’t happen all the time so we’re not sure why this is happening.
i.e. https://businesshub.bellmts.ca/business/sales/mastering-social-selling/

This blog article didn’t pull the image.

This blog did pull the image:

Tweet: https://twitter.com/Bell_MTS/status/996125182094954502