Only one button per page???

The first button I put up works PERFECTLY! Like a charm. I added more buttons and it screws them all up. The pop-up window becomes full screen and then when trying to cash out, it just freezes and goes in circles. I saw someone had a work around with iFrame coding, but I tried that and it makes things look hideous on my page. This has to be something in the coding on this plugin, not from Paypal. Are you working on this issue Scott Paterson??

https://www.ads-software.com/plugins/easy-paypal-digital-downloads/