shopify development within the product pages

Hi, I had a freelancer do some work on enabling some custom features, using the 'infinite options' app for some new products we are launching on our website. They have unfortunately not completed the work to a satisfactory standard as the features do not work correctly on mobile ( which is the main device used by our customers) The main issue is how the features function when a customer is looking to purchase the product. To understand the issue more please check [login to view URL], search all products and select test £17, then compare desktop vs mobile. We also have a requirement to add further products once this has been fixed. Thanks Martin