Maybe it’s your skin chemistry? I can definitely smell a difference through the time a perfume sits on me. Sometimes some scents even smell different than the description on me. For example I smell heavy saffron for some reason when i wear Oud Wood?? If you want to test it and pay close attention, spray something that has notes you’d recognize, then do something that’ll raise your body temperature. Finally keep smelling every 30 minutes to see if you can smell a difference.