Seeing how you’re using both Cloudflare and WordPress, please make sure both are set up correctly like this:
If you use any other method, it may not work. Especially the Automatic HTTPS Rewrites has been known to cause many strange issues like this.
As far as Elementor’s recommendations go, I don’t see anything that would prevent it from working here. We meet the minimum requirements, have the zlib extension enabled and don’t use ModSecurity, so there is nothing that should prevent Elementor from working as far as I can tell.