When you edit a title or subtitle on a published post, it will only update on the post page itself. Additionally, you also need to update your custom title on your post previews to make sure the same title appears everywhere.
Updating your custom title/subtitle
- Enter edit mode by visiting the post page, clicking the gear button in the top-right corner and choosing Edit story.
- In edit mode, click the menu button in the top-right corner of the page.
- Once you're done updating, click Done to save your changes, and then hit Save and publish to broadcast your new display title and subtitle. When you publish those changes, they will be reflected across your Medium listings and post previews.