ArtByPino

I understand what you are saying. On my blog, it looks fine - I say that based on comparing the manually entered/formatted title for the blog versus individual blog entries. www.artbypino.com/blog. SS says that they format it as H1 by design. https://support.squarespace.com/hc/en-us/articles/360002076628-Heading-tags-and-Squarespace

When you type out your [domain]/sitemap.xml, does it show the page you are trying to hide/noindex? If it does then your turning it off is (obviously) not working and SSS should be able to resolve. My experience with some 3rd party tools is that despite turning off SEO (for example, for blog, turning off categories and tags), it still gives me duplication and canonical errors and I just ignore those. Additionally, some pages also are displayed with AMP errors by the crawlers of the 3rd party bots which I also ignore. https://www.google.com/webmasters/tools/robots-testing-tool?hl=en will show how Google reads your robots.txt and I would go by that rather than what SEMRush says.

I take it that you have requested a re-index or live URL in Search Console?

Do you mean Google's data highlighter? Perhaps, try schema.dev. @pinoshah

Yes, the work around is to generate structured data markup yourself and insert it on the relevant page. It will then work in conjunction with the SS auto-generated markup and resolved the issue. FAIR WARNING - structured data markup is a bit over-bearing. Sites like FIVERR or UPWORK has talent that can help you generate structured data. Alternatively, check out schema.dev tool and see if it works. @pinoshah

What is the index function? Do you mean the option that asks whether you want to hide pages from search engines? Also, where does one find a 'section?' or do you mean tags and categories? @pinoshah

Am a bit confused. You say that you set-up GA on September 2? Right? But, you are comparing data from SS traffic panel to August 13? So, you have verified that on September 2, in GA, there were over a 100 views? @pinoshah

I take it that you have tried turning off the promotional pop-up - essentially, to reset it - and turning it back on again and it still didn't fix the problem? @pinoshah