Hello,
1) Contact WooCommerce gateway PayPal express checkout plugin to fix the js error that appears in console http://prntscr.com/psct2q because this js error may cause different issues for other scripts on the page.
2) Of course, you should have both descriptions if you filled the short description and long description fields. Provide us with temporary Dashboard and FTP access to your site to check why you don’t have both descriptions.
Regards