Upfront Global Padding Error

Hi, when I set a div to not get the global padding and save it, it works alright. But then, when I open Upfront Editor again, and save it, the divs global padding are just lost. Here is an example video: https://www.youtube.com/watch?v=cgyT-dfAol0
What should I do about that? Is it really an error? Is the developer aware of it? Thank you!