Your website is working according to the design layout, if you want to change it to three column edit your page withe elementor and select mobile screens mode and change all column width of your require section to 33% it will display your section into three column. https://prnt.sc/115ygxy
1) Please provide URL of your site and temporary wp-admin access.
2) Do you use Elementor or WPBakery? Enable one of these editors for static blocks and edit the content, for example – https://prnt.sc/11732qk