Could you please make the page accessible so that i can troubleshoot the issue and also share the screenshots of the issue so that i can better understand it?
You can use this tool http://www.responsinator.com/ to test your site on different mobile devices and take screenshots to share with me.
Same as me, i use page builder plugin as well.
See att screenshots, how can i remove the white gap between header and content?
The image there is in a row(1920 x 600), set on full width stretched layout mode.
No problem on ipad landscape view, smaller than that there is gap between rows, even after i set the row bottom margin at 0px. My url
To help keep support thread separates you should create your own thread for your question here https://colorlibsupport.com/c/sparkling/ instead of replying on others thread as it makes the thread messy and hard to read.
If you want to you can also add reference of this thread in your newly created thread.
You can try resolving the issue by adding the following CSS code in the Custom CSS option of your theme on the below path.
Admin Area -> Apperance -> Theme Options -> Other -> Custom CSS