changes to WP-admin or possibly upgrading WP admin. Were you using the standard custom fields or a 3rd party plugin? It could also be something from a new theme you have installed? Need a little more detail as to what has changed between the last time it worked correctly and now to answer more concisely.
I had a client ask this recently after upgrading WP and it turned out to be very simple check that ‘Custom Field Template’ is checked on the ‘screen options’ drop down menu in the top right of wp-admin.
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