If you're in a part of the site with the old-style list of threads - like here, or AIBU - using the back button to return to the list from a thread takes you back to the point on the list where you left it.
But if you're somewhere where the topics appear in the newer format, like Relationships or Telly Addicts, the back button takes you to the top of the list of topics every time, no matter how far down the list you'd scrolled before opening a thread.
I find the latter really irritating! Sometimes you might not have been on the site, or a particular section, for a few days so you want to scroll a fair way down to see what's been posted recently, but if you then open any thread and decide to go back after reading it, you're pinged right back to the top of the list again,
Is there any way the back button could work consistently and take you back to the point you were previously at when you opened a thread? (For completeness I use the desktop site, variously on Edge / Firefox / Safari and the back button behaviour is the same regardless of browser.)