Quantity changes on my cart page are no longer reflected after a recent theme switch. The problem affects every product in the store, not just a subset, and it breaks the discount logic provided by the Fast Bundle app. I need someone who can quickly trace the conflict inside the new theme (likely in cart.liquid, cart.js, or the AJAX API calls), restore real-time quantity updates, and ensure Fast Bundle’s automatic discount calculations continue to fire correctly. Liquid, JavaScript, and Shopify AJAX API proficiency are essential, and familiarity with Fast Bundle or similar bundle/discount apps will make the job smoother. Deliverables (acceptance criteria): • Quantity increase/decrease instantly updates totals, mini-cart, and cart page for all products. • Fast Bundle discounts remain accurate after each quantity change. • No console errors or theme glitches introduced by the fix. • A short note outlining what you changed so the patch survives future theme updates. I’m ready to give theme access right away and can test on multiple devices as soon as you push the update.