Why is my row larger than container by 15px padding?

Question

Layout

For the first time I encountered the problem that the line goes beyond the container and thus its contents.
additional: And in some cases it does not reach the right side of the container at all, as if it works like a flexbox in terms of content size, it doesn’t matter that you split the entire line into 2 columns

Answer 1

most likely nested row in another row