Wacky code all over Checkout pages

I just setup all my site to get Paypal Checkout and now there is all this wacky code on my checkout pages. I am not sure what the problem is, so I am hoping someone can point me in the right direction. I did have a PHP developer do some custom work for my products pages, so not sure if this is something I need to address with him, but it was working just fine until I started integrating the checkout stuff and SSL certs.


I've attached some screenshots to help...

Any help would be much appreciated!