Underbetting at 200NL FR

[Pozzo]

What's the deal with all the weak donk betting at 200NL? I don't know if it's specific to OnGame, as that's the only place I've played 200NL. At 100NL, weak bets (~1/4 pot) seemed to always mean weak/draw or very strong. But here people do it all the time.

Does this become common in higher stakes games?

I'm having difficulty making sense of these bets because the players are such donks (definitely worse than 100nl). 4 people to a flop with pot of like $25, someone leads out for $5 and everyone folds. If I'm last to act or if I have some piece of it, it's hard to resist raising, but when I do I just get called and I end up having to fold my mediocre/nothing hand on a later street. And there's no way these dudes have monster hands everytime.

[Runner_Runner]

[Zmej]