issue after wordpress update

On this page I have set up a full width container with 2 columns. In the left column I have used a background image for the container and a tagline box as builder element.
The columns have been set up to 'equal height' and used to display like that; the image used to be as high as the coloured block on the right.
After our most recent update of Wordpress, the background image only shows up for a small part - the size of the tagline box.

Would you be able to help me to get the left columns cover full height?

Thanks a lot