Hi There,
Oh sorry about that, I did actually tested it on each stack but did not anticipate that you’re using a Custom Header.
Ok, so on the Renew and Ethos stack the title is part of the x-landmark which is a part of the standard header. So if you don’t use the standard header you don’t get the x-landmark, therefore, the page doesn’t get the title. Unlike in Integrity and Icon stack, the title is part of the content, so it doesn’t matter if you have a custom or standard header the title will be there (unless you use a Blank - template for your page)
For now, we don’t have the x-landmark for the custom header, but this is a big part of the future of the Pro builders, to have a dynamic element where it outputs data base on the post/page.
What I can advise you now is to add a page title to your page manually, you can use the Headline element or much simpler the Classic Custom Headline element.
Hope this shed some lights,
Cheers!