Fenix LD20 r5 question



So a nice package came for me in the mail today, my new EDC light. My ICON rogue 2 dissappeared a few months ago so i figured why by another one, just get something better for 20 bucks more

My question is this, when im playing with the low, medium, high settings, low and medium have almost no noticeable difference at all. Honestly, low looks like its puttin out way more than 5 lumens. Is this normal? Could the circutry be faulty?