I would know if they reapply. Top notes normally doesn't stink that much since most fragrance open with fresh citrus notes. Only when it hits middle notes or the end notes it fuses with sweat will come off really smelly.

It is weak only if you buy it from non official store. Bear in mind if you buy from shoppee or any place that claim that they are "authentic" apart from parkson/aeon/sogo/official boutique/official site, chances are you are getting AAA grade or worse. Pasar malam one confirm straight up low grade replica.

I've smell so many fragrance in my lifetime that I can tell apart knockoffs and authentic fragrance (Knockoffs below AAA grade). AAA grade is hard to distinguish because it smells just like the real thing but I guess the difference is the dilution which makes the performance very weak. Below AAA grade you can smell that they've added some other chemicals that smells like faint thinner. Pasar Malam knockoff is the easiest to differentiate because they smell different in terms of notes altogether (basically similar smell but completely different scent and notes) and they tend to have the generic dry down (basically mid and end notes smells like fragrant alcohol with little trace left of what it is supposed to smell like)

Perhaps my nose is sensitive but for those who sweat + sweet fragrance confirm smelly. Try spraying a winter frag on a tissue and leave it out on the sun for a good 10min, it will give you a pungent smell if you have a sensitive nose.