Marketpress Checkout Process Directing to wrong pages

When I go through the checkout process I am directed to another site that is on the same host as my current site. This link: http://www.seal360fitness.com/store/shopping-cart/

Is directing me to the other site, http://www.sealtrainingadventures.com?

You can test it out by going through the process on this product here:
http://www.seal360fitness.com/store/products/seal360-functional-fitness-4-week-program/

Thanks,
Doug Nelson