sidebar is showing at the bottom of the post on desktop

Hi,

I implemented Generatepress to my blog but when I view on desktop, the right sidebar is showing at the bottom of the posts instead of the side panel.

HEre's a screenshot: https://prnt.sc/r132qd

Starting the "Follow" up widget, it should be on the sidebar. It looks ok on my browser but when I view on incognito, it looks like that (as a mobile)

Thank you.

Mary