Because the author doesn't know what that tag means. Maybe they thought: "Hey, the MC was a normal human at the start and now he's OP! Imma put Weak to Strong in the tags!"
Scribble Hub Forum
SRB
melchi
They were weak in chapter 1 and strong in chapter 2. That's how that works right? ;)
RepresentingWrath
Translators or mods tag works on NU.