I have a custom fieald in Leads and in Contacts the same (not mapped as it does not appear somehow, why I wonder??). When converting a lead the data were not passed to Contact's custom field! Why?

I have a custom fieald in Leads and in Contacts the same (not mapped as it does not appear somehow, why I wonder??). When converting a lead the data were not passed to Contact's custom field! Why?

I have a custom fieald in Leads and in Contacts the same (not mapped as it does not appear somehow, why I wonder??). When converting a lead the data were not passed to Contact's custom field! Why?