Why is there a high dropoff rate at checkout on my ecommerce site?

Hi! I kindly need urgent assist to rectify this below mentioned issue as we are losing business as we speak. We noticed on our analytics that 500+ people have entered their details to purchase one of our products, but then there is a drop off that occur when proceeding to the check out page.

Does this mean that there is something wrong with the PayFast > Shopify integration or what causes this?

Your urgent assistance would be greatly appreciated.

Regards,