Too many problems

Hello team,
First of all, I appreciate your hard work and your awesome theme. I edited my homepage and everyone praised it. But the problem getting started from the blog post.

There are the following problems I was facing

Problem number 1:
Certain HTML code was not working. When I added the HTML block and paste the code, In the preview of the block it was showing.. but in the post, it was not showing in the proper place. Code moved to the bottom of the entire page.

I can’t alter this code because of this third-party code. On other themes, it is working fine.
here is that code…
<form><script src=”https://cdn.razorpay.com/static/widget/subscription-button.js&#8221; data-subscription_button_id=”pl_HaHJWoTBkdnoPM” data-button_theme=”rzp-dark-standard” async> </script> </form>
I added this code in the widget area and post too.. both have same results.. currently it is only on widget area.

Problem number 2:
In the post, I used Page break block so that post can be broken into many parts. unfortunately, it does not work with your theme and all contents were looking on the same page.

Big problem number 3:
I was looking for solutions to both problems but perhaps I messed up and the posts are looking so ugly.
I went to customize > header, footer, template pages > post template when I saved it, everything got messed and the layout becomes ugly.

Please help for my all problems

The page I need help with: [log in to see the link]