Hey KF,
at the moment I can see that the last two items in the “New Features” section are well-aligned, the only problem is the two top items, and that stems not from the column shortcode, but from the fact that you’ve positioned the “Responsive” title on a separate line, so that it got wrapped into
elements by WordPress, while the “Modern” heading is simply enclosed in tags. If you make the two first headings analogous, the rest of the text should align itself as well.
In any case, you can try e.g. Synved’s Shortcodes plugin as an alternative.
Sincerely,
Andrii / Satori Studio