I would suggest you to take a look at your page.php file, where you need to add a php code calling the sidebar.php file. If that doesn’t work, try using Underscores to design your website. It’s a base theme for WordPress. It’s only the default files with no customization. You have to design everything from scratch, but I’ve never had any problems with it. If you want to, I can take a look and see what’s going on. Just message me.
