We installed your theme on two websites today. Both websites are having the same issue.
When you go to preview a page, not all the changes are showing in the preview. Adding a border to an element, the border does not show in the page preview, but if you save the page and view the live updated page you will see the border. We need the Preview to show all changes like it used to. See attached screenshots for reference.
Could you please check how it works with some default WordPress themes like TwentyTwenty or WooCommerce Storefront to understand is it our theme issue or not?