Yes, this is the first thing I do with every design change.
The class in question seems to be “.generate-colums”. This adds 30px padding on the left. Which is fine for the right column.
In single column view this is added to the single column.
I could remedy the situation with this css snippet:
@media only screen and (max-width: 768px) {
article.generate-columns {
padding-left:0;
}
}
In my opinion this should be default for mobile.