I appreciate you letting us know which theme you are using as that is helpful! Looking into the options available for theSunrise theme, it looks like this is a third-party theme. With that being said, we are a bit unfamiliar with the style of coding that is used within the theme. I would suggest in this case reaching out to the developers of the theme and requesting support with theadd to cartbutton automatically navigating the customer to the cart page.
Let me know if you have any questions or concerns.
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