It appears S2Member is using an outdated version of the PayPal Express Checkout code. PayPal Express checkout has implemented options to change the button and have a pop-up as opposed to opening a new window. When are you going to update the S2Member code to be current with current PayPal code. It appears the PayPal code in S2Member has not been updated since 2014.
https://developer.paypal.com/demo/checkout/
https://developer.paypal.com/docs/integration/direct/express-checkout/integration-jsv4/
S2Member update to current PayPal Express Checkout
I created a GitHub issue to bring this to the attention of the developers. https://github.com/websharks/s2member/issues/1088. You might want to post there about this.
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