WORDPRESS: I’ve checked and my WordPress theme is changing the title of my posts and pages to an H2. How can I fix this?

This is quite a technical fix and involves editing the actual theme files. If you’re using a child theme this can be tricky, if not then you can use the editor to edit each of the template themes within the dashboard. But if you update your themes, you may have to go back and redo the fix. I’d advise using a developer to do this.