Looks like more of a web browser behavior issue, the more I test, the more browser pages are left opened. Suggest trying the following tweaks to your item button code.
In Step 3 of the button creation process look at the bottom you will see "Advanced Variables".
Note the text box near the bottom of the page.
There you can insert extra variables.
Insert the "shopping_url" variable and value:
shopping_url=http://www.yourwebsite.com/your_page.html
There's no HTML extras, just the name of the variable, an equal sign and the value.
Enter the variable and value, then save the code. Do this for each item button.
Next, Modify the Form target line for each of your item buttons on your web page:
Replace the variable target="paypal" with the variable target="_self".
<form action="https://www.paypal.com/cgi-bin/webscr" method="post" target="_self">
Also make the same change to your View Cart button. In addition to that change add
the "shopping_url" variable to your View Cart button code
Add this line:
<input type="hidden" name="shopping_url" value="http://www.yourwebsite.com/your_page.html">
You can add this line after the first line of code:
Finally, after you have made your changes to your item button code, be sure to delete your web browser's cookies before testing the changes. This ensures a clean start. Delete the browser's cookies, temp files and history, then close the browser, reopen it and test your code.
