Checkout skipped in Checkout process (Help)

I have a Marketplace network that im buildong on Marketpress. I filled in the blanks and followed instruccions for Paypal Chained Payments but when ever I try to checkout (using sandbox mode) on one of the merchants sites it skips the checkout process, like so:

Review Cart>Shipping Information> Checkout (SKIPPED)> Confirmation (When i press Confirm Payment it gives me an error from paypal).

The form to fill outs payment option never comes through.

Can someone help me with this?