I cut and pasted your code into a WordPress page and it worked - but WordPress threatened to change the HTML. It wanted to add after <table> <tbody>and </tbody> Before </table> and it put <figure> </figure> on either side of your image. I have found if you test too much that PayPal doesn't let you get to the site - I'm not sure if it's my cookies or what, but code has worked the next day. So I think the button value is good. Try it on someone else's machine.
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