Alain_B

Still getting twice the posts, once without the header (such as the title) and once with the header (the actual title of the post).

Thank you very much!
I don’t have Appearance/Customize/Custom CSS
I do have:
Appearance/Customize/Site Identity
Appearance/Customize/Menus
Appearance/Customize/Widget
Appearance/Customize/Static Front Page
Appearance/Customize/Editor

I added on the editor of style.css just between #page-content and aside, like this:

#page-content { /* Need a margin from the two floating elements */
	width: 100%;
	padding: 15px 0 15px;
	overflow-y:auto;
}
.single-post .attachment-blog-featured {
display: none;
}
#content-wide {
	width: 66%;
	margin: 0 1.5% 0 1.5%;
	float: left;
	overflow-x:hidden;
}

But still didn’t work.

Again, the actual post looks correct, but I want a page to show the content of that post, and this is where the data display on the page gets duplicate
Thanks!