Hi there,
background images that are set to Cover will resize to fill their container – as that containers size/aspect ratio will change depending on its content and screen size it’s difficult to make it fit all screen sizes.
To keep an image responsive try using % padding – eg. 30% top/bottom and 2% left and right. Adjust accordingly for tablet and mobile.
Can i ask that any future GB specific questions are raised in the GB Support forum.
We also have a GB Community you may want to join:
https://community.generateblocks.com