Third party publishing changes not being effected

I use Mailchimp to publish and my changes are pushed through Zapier. Before, maybe 2 - 3 versions ago, I would make changes to the post, unpublish and publish and it would push an updated post to Mailchimp. Now, if I do the same, it sends the original post, not the edited post.

Then as of the previous version, I now have to publish, unpublish then publish again, just to get a post into Mailchimp, so I have to push twice. The first version sent is blank, but the second one isn’t.

Does anyone know what all this is about?

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