In every case, when it shall be alleged by any party in interest that any deed, mortgage, power of attorney, or contract in relation to real estate, to which is appended a certificate of acknowledgment, defective in form, was in fact really and properly acknowledged in due form of law, by the grantor or grantors therein named, it shall be lawful for the court of common pleas of the county in which the land deeded, mortgaged or contracted is situated, to examine into the truth of such allegation, and if satisfied of its truth, to make a decree for the reforming of such certificate of acknowledgments in accordance with the actual facts: Provided, That this act shall not apply where suit or suits have already been commenced to recover the real estate conveyed by such instruments of writing, to which is appended said certificate of acknowledgment defective in form.