It　is　well　known　that　first-order　ferroelectric　to　paraelectric　transition　is　a　one-step　transition　and　it　gives　rise　to　one　latent　heat　peak　and　one　permittivity　peak　during　heating.　In　the　present　paper,　however,　we　report　an　unexpected　finding;　in　Mn-doped　Ba(Zr(0.01)Ti(0.98)Mn(0.01))O(3-delta)　the　ferroelectric　to　paraelectric　transition　proceeds　in　two　steps,　after　the　sample　has　experienced　a　prior　aging　at　the　differential　scanning　calorimetry　(DSC)　peak　temperature　and　followed　by　cooling　down　to　a　fully　ferroelectric　state.　The　two-step　transition　is　evidenced　by　a　split　DSC　peak　as　well　as　a　split　permittivity　peak.　These　abnormal　effects　can　be　explained　by　considering　that　aging　at　DSC　peak　temperature　corresponds　to　aging　in　a　two-phase　state　(paraelectric+ferroelectric).　Such　two-phase　aging　produces　two　different　defect　symmetries,　which　give　rise　to　different　stabilities　for　the　same　ferroelectric　phase　and　thus　results　in　different　reverse　transition　temperatures.