You are right. The problem is that the Post Content widget in your single post template is picking up the homepage content because the template preview defaults to showing a page, not a post.
This is normal Elementor behaviour — not a real problem.
The template is previewing against the wrong content. Your actual published posts will show correctly.
The quick way to verify this:
Step 1 — Go to WordPress Dashboard → Posts → Add New
Step 2 — Write a simple test post:
- Title: Test Article One
- Body: Write 2-3 paragraphs of any text
- Category: Select Living Room
- Featured Image: Upload any image
- Click Publish
Step 3 — After publishing, click View Post
Step 4 — Look at the live post URL in your browser
If the template is working correctly you will see your designed template applied — with the proper title, meta row, divider, and the test content in the left column with sidebar on the right.
