Why can't search engines index my website due to HTTP and HTTPS difference?

I keep have some issues with search engine saying that they can not index my website because it is a redirect!

i think it is something to do with the difference between HTTP:// and HTTPS://

this is my shopify store https://romanianpharmacy.myshopify.com/

and domain bought from 1-2-3 reg www.maratonforte.co.uk

This report is wrong. I don’t know to why it refers to index.html and index.php.

I checked your website domain and it is well configured.

Also your website is not really well indexed at the moment.

I suggest you to go to Google Search Console and create an account if you haven’t done yet. Register your domain and submit the sitemap https://maratonforte.co.uk/sitemap.xml

Google Search should start to index your website properly. Check your Google Search Console after some days or a week, if there are real problems are reported there.

When using Yandex Webmaster be sure that you added your property without www, cause in your case you main website is without www.