[Plugin: Cart66 Lite :: WordPress Ecommerce] Paypal standard shortcode button disappearing

Hi, I LOVE this plugin and want to test it out before i upgrade BUT i have a squeeze page with the [checkout_paypal] shortcode and it keeps disappearing for some reason! I’m totally confused. It will stay for around 5-10 minutes and works, delivers the product fine and then, it’s just gone, poof! i just don’t know what is happening and i have been trying to figure it out for a week. PLEASE PLEASE PLEASE help me! I don’t want to use another plugin.

https://www.ads-software.com/extend/plugins/cart66-lite/