Product Fields not showing on WP Cart, Checkout, Emails and Orders

HI Saravana, WC Field Factory (3.0.3) has been working well for a long time now on my clients web site, but recently it no longer carries the custom product fields I have added to products over to the Cart & Checkout pages, nor do they show up on the order or the emails being sent. I am using WooCommerce 3.5.1 on WP 4.9.8. Help would be appreciated.

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