The columns in a section are managed as Flexbox with display: flex;
in the the column-container. In Mobile and Tablet Mode the columns are allowed to break/wrap by with @media (max-width: 1024px) { .elementor-section .elementor-container { -ms-flex-wrap: wrap; flex-wrap: wrap; } }
In Elementor Desktop Mode columns have to stay in one line.
By default elements in Flexboxes are not allowed to wrap. That’s why your six columns get the width in proportion of the parent’s width. So summed up we’ve got “180%” and i.e. “71%” is in real 39,44 %.
The automatic calculation by Elementor isn’t always correct and you never really know where it subtracts or adds width of the neighbour columns.
I recommand you to calculate manually.
OR you can install the Plugin “Happy Elementor Addons”, here you get more control with “Happy Elementor Addons” and “Column Order”