I have upload my Magento2.3 site on site ground. Others things are working fine but order not place redirect to checkout cart page.
[2019-04-19 12:15:47] main.INFO: Broken reference: the 'div.sidebar.main' tries to reorder itself towards 'main', but their parents are different: 'div.sidebar' and 'div.col-main' respectively.   [2019-04-19 12:15:47] main.INFO: Broken reference: the 'currency' tries to reorder itself towards 'store_language', but their parents are different: 'header.panel' and 'theme_header' respectively.  
live site link
But same project working fine on staging site.
It hosted on digital ocean .Working fine every thing .kindly describe the issue