If you turn on this option, the section with description will be sticky when you scroll the page. In case when the description is higher than images, the images section will be fixed instead.
If you are using custom layout, you need to edit the product layout and enable the sticky feature for the desired container: https://take.ms/GNRXo
Please deactivate all the 3rd party plugins and activate only theme-required plugins on the site and then check the issue. I am sure your issue will be solved. Then Activate the 3rd party plugins one by one and check which plugin is creating the issue for you.
Otherwise, if the issue still exists then keep the 3rd party plugins deactivated and share the WP admin login details of your site so I will check and give you a possible solution.