iFrame – opening lower half of box, but not upper half

Wonder if I could get some help please. 🙂

When the iFrame launches, only the bottom part loads. If I move the link further down the page it works fine, but I need to have it near the top as it’s the order button

www2.brookfieldrps.com

Thank you 🙂

https://wordpress.org/plugins/wp-colorbox/