Marketpress mixed content

I have a site with marketpress, setup to use both paypal and stripe, however, when i enable stripe, i get a mixed content warning on the page the user will enter the credit card cvv number.

This is being caused by the image in tooltip for the cvv number.

To recreate visit
Password = Welcome1
add a product to the cart
go to checkout
add email and address details
select next x 2
padlock disappears

Looking in the code it seems to be .mp_plugin_url('ui/images/cvv_2/jpg') that is causing the problem, but im unsure where that is called from, can anyone help?

And why does it not use site_url() :slight_smile: