Browser Back Button error - adds/repeats Add to Cart action

[MichelleC]

Fix one thing, break another...sigh. So= now, the browser back button action, creates a loop = where the last item selected, and put in cart, is then added in with each action.

For example, you place item A in cart, and say you really like back browsing instead of buttons (Continue Shopping) and you back browse. Say you decide to back browse again= if you look at View Your Cart status (the script display) or chose to click through to cart, the last item you added to cart has now been added for every time/instance you took that action.

have tested and seen this error in:
IE 7
IE 6
and in Safari (surprising)
But, does not occur in Firefox 3.0.5
thanks, in advance, if anyone can comment on it- has run into this. I don't know where to start...it did not do this before...something in the cgi string-??
any help greatly appreciated. thanks so much.