LEAD FORM - CONTACTS FROM PIPEDRIVE

Seems that the lead form is not recognising existing contacts that are in Pipedrive, meaning for every lead we have create, we have to create to duplicate contact ( new but same contact that may already exist in Pipedrive).  Not sure if this is deliberate but seems to be bug, and would make sense for user when creating new lead to be able to search and select Contact that already exists in Pipedrive, and avoids creating duplicate contacts for leads and deals.