Hello @portrait-man,
As we do not have access to your backends , the only option is the site URL from where we could examine the issue through the inspection. We can find the cause only after inspecting in the page in which there is issue and help you further.
Also, to guide you to set up your site, we have the themes official documentation which you can refer while setting up your site .
Documentation link :
http://themepalace.com/instructions/themes/photo-perfect-pro/
Further more if you have any confusion while setting up any section we are here to help you guys .
Now to set up the Demo you have to set your Front Page display to Your Latest Post . To show the vertical image as in the demo create the post with vertical image with size (439*706) . Post with the vertical image should be at the second position in all post listing page i.e tha post should be created at second last .
Screen shot :
https://image.prntscr.com/image/S-ESRo3FRGaOtTjGVvQNwA.png
Hope this helps and hoping for the co-operation in the future as well .
Best Regards!!