Green Leaves on Facebook Preview

Hello,

I’ve managed to remove green leaves from most places in the theme’s header, but it is still showing up in the link preview on Facebook.

For example, I pasted the link to this page (https://whitehillcaravans.com/index.php/used-caravans-for-sale-in-northern-ireland/) into a Facebook message with a customer, and the link preview in that message shows the green leaves. I have a screenshot of that, though it looks like I can’t upload it here.

Any ideas?

Thanks!

The page I need help with: [log in to see the link]