1- Actually, Cloudflare/CDN is very good for the site speed performance. But, because of the cache, it causes the issue. When the server cache got strong the site will load from the cache and causes unexpected issues on the site. Try to flush the server cache completely and disable the cache system until your site is in maintenance mode.
2- Unfortunately, NO, there are no additional/recommended settings for the widget cart.
3- Your service provider will be able to do it. There are no settings in the theme for it.
Further, I have found these articles please check them:
