PayPal's item button code is basically an HTML Form. It's best when you create new code to first test it using a blank web page. If the code works, then you're good to move on to your actual web page. If the code fails there, then the issue is associated with your web page, site host or HTML Editor.
I tested the your item button on your page and it worked however, that's not to say something is still not correct. My suggestion is to use the "hosted" version of the code, not the "encrypted" version you're using now. Encrypted code can be strange at times and some HTML Editors have been know not to play well with encrypted code. The "hosted" version is safe if that's your concern and it's a bit easier to troubleshoot than "encrypted" code. Also, what web browser or browsers have you used to test your code? That can also make a difference.
Try the "hosted" version of code, note you will have recreate it again as "encrypted" code is not stored on the PayPal Servers but "hosted" is. After you create the code, test it with a blank web page, if it works, them move on to your web page. Below is an example of a blank web page:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>Test</title>
<!-- START META TAG SECTION -->
<meta charset="utf-8">
<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
<meta http-equiv="Content-Language" content="en">
<!-- END META TAG SECTION -->
</head>
<body>
<!-- INSERT TEST CODE HERE -->
<!-- END TEST CODE SECTION -->
</body>
</html>
Copy and paste your code, save it locally to your computer with a name like test.html or test.htm, then open the code with your web browser.
Last tip:
After you have made your changes to your item button code, be sure to delete your web browser's cookies, temp files and history 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 then test your code.
