Shopify Cart & AJAX Bug Fix

Shopify Theme Bug Fixes I need an experienced Shopify developer to investigate and fix the following issues in my Shopify theme. Issue #1: When the maximum available quantity of a product is already in the cart and the customer tries to add the same product again, Shopify returns a 422 error and some header icons (Cart, Wishlist, etc.) become unresponsive. Issue #2: Sometimes product quantities are doubled when adding items to the cart. For example, adding a quantity of 2 may result in a quantity of 4 in the cart. Issue #3: On mobile devices (screen width below 767px), after adding a product to the cart and opening the mini cart from the header, a transparent overlay blocks interaction with the mini cart. Requirements: Work on a duplicate theme first. Investigate and identify the root cause of each issue. Fix all three issues. Test the fixes before completion. Provide a summary of: Files modified Functions modified Root cause of each issue Exact fixes implemented Important Testing Requirement: All issues must be tested and fixed across every add-to-cart method used in the theme, including: Adding a product from the product page. Quick Add from product cards. Direct Add to Cart from product cards. Products with variants (such as color, size, etc.). Products without variants. The fixes should work consistently regardless of how the product is added to the cart. Please verify all scenarios after implementing the fixes. Budget: $40

Project ID: 40536555