Layout issue on Blog Post page

Hello Tammy,

I hope that you are able to help resolve a layout problem.

I'm using the latest version of the Studio Theme. The theme is excellent except for this one anomaly.

The header/site-logo layout changes on the Blog Post page - it's a new site so there is only a test post up. You can see it here - rtodoctor.com.au.

I have also attached a screenshot to illustrate the actual anomalies - the site name appears over the top of the header logo and the nav-bar is near the top of the page. It's like the header-wrapper css is not being picked-up...

All other pages appear correctly and consistently.

Thanks for your assistance.

Regards

Stephen G