Once you drag the map, the background color of the image disappears. I have this set as a fallback color for posts without images. Also posts with images will also not show images upon filter (by dragging the map or any other way of filtering).
With Bricks 1.8, the (dynamic) background styles have changed. The dynamic styles will no longer be added inline like style=“background-image:url(xxxx)”, instead, we are now creating those styles using the data-query-loop-index attribute.
I am unsure how the WP Grid Builder generates the looping HTML and styles, but the data-query-loop-index attribute is a must in Bricks 1.8.
Your best bet is to contact the WP Grid Builder devs and tell them about the changes so they can adjust the plugin code. They can contact us anytime if they have any questions (help@bricksbuilder.io).