Shopify add to cart page is playing up need help

Hello. My name is Marko and I am an Engineering Graduate with an MBA degree. I am a full time freelancer and I will work hard on this till completion. An Expert Shopify website developer on freelancer.com and I do not bid on projects which I am not sure. I will not disappoint you and I will do my best for give you a perfect solution. If I have an opportunity to work with you, That's my pleasure. No milestones required in advance, please pay me once the job is 100% complete. Also, before you consider awarding me the project, I can provide you with some sample files via your requirements. Please message me, so we can discuss here as I may have some questions. Thank you. Marko R.