Issue with Paypal credit card payment redirecting to shipping page

[wazmo]

Hi, i'm having an issue with my paypal payment option on my site. Id like to primarily use paypal as my payment option on my site to accept credit card payments. The problem im having is that when going through checkout after clicking through to the paypal payment option at the end and entering your credit information it redircts to the shipping page and you must then reselect your shipping option and click the paypal button a second time to complete the order and have the payment processed. Im curious as to why it dosnt simply finish the payment process after filling out the form on paypal. Is there anyway i can fix this? my website is http://www.moon-tide.com/Shop