Customers filling out checkout details but no payment

Hey, hopefully someone can help, i am receiving around 250-500 visits a day to my website and around 25-50 added to checkout a day, i can see that customers are filling in shipping information and details although aren’t going through with final payment, i can see that some customers have tried twice within a short time. I’ve checked all my settings and markets and all seems okay. Hope you can help. Thanks!

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