[Theme: Zerif Lite] Rendering Issues Dynamic-Front-Page vs. Static-Page

Hello Support,

I am using Zerif Lite with the WordPress setting front page display setting set to “Your latest posts”. Everything renders correctly here. You can have a look at https://www.fortekgmbh.com – this is how the page should look like.

Now I am trying to remodel the page to use a static front page. I have made a test page and facing issues with the background image display. I have created a static page template, which loads the very same content as the “dynamic” front page.

Please have a look at https://www.fortekgmbh.com/homepage-test/

The transparency overlay is missing in the header.
The background image is missing in sub-sections, ie. #aboutus and #contact.
But the background image is displayed in the footer correctly. ie. with image and transparency overlay.

What may cause this issue? Any suggestions?