Fix Shopify Checkout Failure

Traffic is steady but sales have flat-lined for a month, and it started right after my SEO team tinkered with the theme. Something in the cart or checkout flow is now broken. I need a Shopify expert to:

• replicate the problem on a desktop or laptop using Google Chrome
• trace whatever code, app, or theme setting is blocking the normal Shopify checkout sequence
• apply (or clearly document) the corrective fix so customers can complete their orders again
• show brief before/after evidence that the cart advances to the standard Shopify checkout page

I’ll share the store URL, theme access, and any recent change logs as soon as we connect. Liquid, theme customizer, and Shopify admin skills are essential; familiarity with common SEO app overrides may help. Once the checkout works end-to-end, we can discuss an optional health-check of the rest of the site, but the immediate deliverable is a functional checkout.