Searching the Pulse forum it seems to be have been reported before (the blog post page not having the same style as the main blog page) and this is the solution:
Please follow the workflow as stated there (ignoring the version numbers):
After reading both of your posts, I was create everything new from the ground up:
- upload Pulsecms5.2.1 Template to my server (root directory /url)
- create my site with Blocs 3.0.6 (add a new container with Pulse CMS)
- set the setting (Object -> from Block to Blog, assign a Block ID)
- create and apply a class to this container
- save and export the Blocs Project (File -> Export -> Export as… -> Pulse CMS Theme - > Pulse 5)
- full overwrite the folders on my server (Container and Template)
- Initialise my page url/admin/install.php
- did my individual settings under url/admin
And now it works. The style (single blog post page) is the same as in the blog post page itself.
Let us know if that works 