Back Button sends me back to beginning of story instead of back one page...?

Twine Version: version 2.3.8
Story Format: Snowman 2.0.2.

Currently, if I push the browser’s back button during my story, it sends me back to the start page of my story. Is there code I can add that makes it so if the player pushes the browser’s back button, it will just send them back to the previous node instead of sending the them to the beginning?

alternately, is it possible to just disable the browser’s back button during the story?
i just don’t want the players to have to end up back at the beginning if they accidently push the back button.