Magento 1.9 NGINX server with form key problems

Migrated our Magento 1.9 website to NGINX with Varnish, runs fast, but have form key problems whereas users can not login in (just refreshes the page) and parsing errors are seen on form pages on frontend website such as " /> on login and checkout pages and /" method="post" id="product_addtocart_form" enctype="multipart/form-data"> " /> on the individual product pages. Please only bid if you know Magento 1.9 on NGINX.