In the post view, for some reason, when I use the pagination to move to page #2 (there are 3 in total) the 3 columns structure only applies to the first row, and then I have one column displaying the rest of that page posts
Solution:
It is post excerpt block, which using 28 Characters limitation setting, it cuts the blocks shortcode of post content, will conducts the problem.
You can edit the problem post, in the post setting panel, section "Excerpt", setup the excerpt in plain text manually, and test again
