Sidebar display issue on post pages

I’ve been having layout issues recently. I’ve done everything I could think of. My posts have to have a 1 sidebar layout. It was ok before but now the post itself has a full page width and the sidebar displays right at the bottom of the page and there is a huge empty space at the end of each post.
I imported demo data just to make it easier to make my site look better. First this issue started with the social icons which should display on the right side of each post disappearing and then some code started to get displayed on the bottom of each post. I couldn’t correct it and so I disabled the social icons. That empty white space at the bottom of each post is where that code started to display. Since the sidebar started displaying at the bottom of each post, I made the sidebar sticky but now it displays on top of the contents of the posts. It’s a nightmare.

1. deactivated each plugin but no change.
2. deleted cache and deactivated w3 total cache plugin.
3. followed troubleshooting that I could find on the theme as far as I know.
4. I changed the theme too just to see if it would get fixed, deleted hueman then again installed n activated but it’s still the same. What might be the problem??
I’ve given a link to just one post but you can check all posts and pages. Even pages are now having the layout issue.

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