You use the old version of theme and the latest version of woocommerce. It can be reason of the problem.
If your site is live, I would recommend you to create a staging site (a full copy of the live one) and update theme to 4.5.3 version on the test site. If you made changes in theme files, you need to transfer them into child theme – https://www.8theme.com/demo/docs/woopress/#3_child_themehttps://www.8theme.com/downloads/http://prntscr.com/m4yrdp
If the update doesn’t solve the problem, provide temporary wp-admin and FTP access to the test site (ask your hosting provider support to create FTP account to your site files and give us the credentials).
