There is a website from which I make purchases on a monthly basis. I discovered early on that if I hit the back button after putting an item in my shopping cart

There is a website from which I make purchases on a monthly basis. I discovered early on that if I hit the back button after putting an item in my shopping cart, instead of pressing their javascript "Continue Shopping..." button at the top of the page, it messes up the session and I end up having to log in again to straighten things out. Thankfully I don't lose the shopping cart contents, but this proves to be a real pita whenever I forget about their buggy session management. That isn't to say that this is the reason some sites disable the back button, or that there aren't nefarious reasons for it being done, but this is one site where I wish they would do it. So, a very small maybe, is that the sites in question are bandaging over bad session management.