Fields not showing in product page

Hi, WC Fields Factory was working perfect until I tried to create other field in the field group, then both fields disappeared, I deleted the second field, then deactivate and reactivate the plugin, then I deleted the group field, deactivate and deleted WC Fields Factory, then I reinstalled, activated and created the field group just with one field, yet nothing.

Please, some help here! Thanks in advance ??

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