This happens because of the theme which may have 769px breakpoint while for Elementor it is 768px. You can switch your theme to Hello https://wordpress.org/themes/hello-elementor/ which is official Elementor theme. If this works well then you can change the breakpoint of Elementor to match with your theme. You can give this a try – https://elementorresources.com/tutorials/how-to-change-the-tablet-and-mobile-breakpoints-in-elementor/
