Caution using back button

[hoggy1]

After I score a loan in Excel and decide to purchase, a macro opens a new IE window for the loan and I click "Invest" to put the loan in my basket.

If you then click the back button/arrow to take a closer look before completing the purchase, and then click to forward button/arrow to complete the purchase the loan count will still be correct BUT THE AMOUNT HAS DOUBLED for that note.

I had seen this happen once before but did not realize what I had done. It is easily reproduced.