I have noticed that when I press the "previous" button in my browser, the page is reloaded from cache and the item shown as .active is not the one I clicked last, but the one initially defined as .active in the DOM.
This might not match with the actual radio buttons state as the :checked one is the last one clicked.
Checkboxes have the same behavior in a similar setup.

I figured a way to overcome this by not using the .active class in the DOM and setting it according to the :checked states of radio buttons at page load.

See this fiddle for an example of the bug, and the temporary fix: https://jsfiddle.net/pr_shadoko/saymu7wa/7/

Tested on :
Windows 10 64bit
Chrome 63.0.3239.84 / Firefox 57.0 / Opera 49.0
jQuery 3.2.1
BS 4.0.0-beta.3
popper 1.12.9