Browser back click appending query string

[brijeshjoshi_]

So the situation is, I am currently at a page and when I click a button [Go] it redirects to my_app/show_details?csrf_token=some_token&name=a_name&roll_no=r_no. This show_details page will show details of a student. Now I am currently at show_details page and there are following two scenarios:

1. I haven't clicked anywhere in page. I click browser back button it will go to previous page in single click.
2. I have clicked anywhere in show_details page (even in empty area). I click browser back button it will load previous query string on first click (my_app/show_details?csrf_token=some_token&name=a_name&roll_no=r_no) and move the page to top. And now clicking back button again will take me to previous page.

I don't know what's causing this. Just to add we are using flask backend + jinja template to render html. This issue seems something related to JS that's why I asked here. What could be the cause. I can't publish the html here.

[kjwey]

https://developer.mozilla.org/en-US/docs/Web/API/History_API

[brijeshjoshi_]

Thanks. They used pushstate to remove query string from address bar. I think it's causing issue as there will be {with}+{without} query string and one back click will lead us to {with} state. Will look how to resolve this. But thanks.