Fake dumbbells or dupes? Should I be worried?

ggmzf

Hey so... I'm a newbie in lifting and I've been doing it for these past 3 months at home... I wanted the bowflex 552 and I saw some on Facebook, bought them, got home and it didn't say bowflex anywhere, box was different, the instructions paper, and I know the originals have the "bowflex" logo on the upper red part, mine ones don't... BUT I have 8lbs and 15lbs single dumbbells I've been using, these "bowflex" ones I bought actually feel heavy so I set the setting to 15lbs and compared the weight with the single one I own of that same weight and it actually matches the weight... Should I be worried? Or doesn't it really matter the "bowflex" logo when the weight is actually accurate? Thanks and sorry if I offended anyone who is a bowflex fan, I'm a newbie please understand...