If the site is missing some styles after migration, try the following steps that we did on Caldecott:
1. Check if there are more than 1 Elementor “Default Kit”:
Go to WP Admin > Templates > Saved Templates > All > And sort templates by title. If there is more than 1 kit, confirm which is the one you will need and copy the ID.
Go to phpMyAdmin and search the key elementor_default_kit on the table wp_options. Finally, change the ID for the one you previously copied.
2. Copy the customizer CSS if it was not copied correctly.
3. Finally, go to WP Admin > Elementor > Tools > Regenerate CSS > Regenerate Files.