My site is running the Brooklyn theme. If I add to cart from the a Product Page or open the cart from the header (cart icon), the cart drawer opens as expected.
I added a buy button to a page template by creating a new section and adding the buy button code from the product-template section. Items add to cart as expected, but instead of the cart tray opening, the page refreshes on the actual cart page.
Pages below - password is "foodisgood"
Working Product Page: https://eatingrd-dev.myshopify.com/products/avocado-toast
Half-working Custom Page: https://eatingrd-dev.myshopify.com/pages/current-lunch-delivery-menu
Note that the cart button in the header works as expected on the Custom Page.
Any help would be appreciated. Thanks!