It appears that line 57 of edd-quardeno.js should reference #edd_checkout_cart_form, not #edd_checkout_cart . The response fromedd_checkout_cart() (which is called via the AJAX function edd_ajax_recalculate_taxes()) includes the #edd_checkout_cart_form div in the HTML response itself, so you end up nesting the div over and over again unintentionally.
It appears that line 57 of edd-quardeno.js should reference
#edd_checkout_cart_form, not#edd_checkout_cart. The response fromedd_checkout_cart()(which is called via the AJAX functionedd_ajax_recalculate_taxes()) includes the#edd_checkout_cart_formdiv in the HTML response itself, so you end up nesting the div over and over again unintentionally.