My Blog page ( posts page ) theme isn’t changing with the new theme [closed]

Interesting. Is there a caching plugin active? Is there caching at the hosting level? Have you loaded the page in a private/incognito browser window?

Have you tried to completely remove the old theme?

What is the URL of the site and the blogs page? I’d love to look at the response headers to see if there is anything there that would indicate what the issue is.