Nothing in this act contained shall extend to, or be deemed or construed to operate against, any subsequent judgment, statute, recognizance, attainder, forfeiture or lien, whatsoever, or against any subsequent bona fide mortgagee or mortgagees, purchaser or purchasers, of any estate, lands, tenements or hereditaments, mentioned or contained in any such prior deed or mortgage, or defeasible deed in nature of a mortgage, who shall have taken such subsequent mortgage, or made such subsequent purchase, before such prior mortgage, or defeasible deed in nature of a mortgage, was or shall be acknowledged or proved and recorded, agreeable to the directions of this act.