Why can't I downvote answers or questions?

Question

When I first created my account, I tried to vote on an answer. But it said that I must have 15 reputation to vote.

After some time, I got up to 21 reputation, and I voted on an answer I liked. But when I tried to vote on another one, it said I must have 125 reputation!

What is happening?

Edit: I've noticed that I can upvote, but not downvote.

Answer 1

This is how the site is designed.

Upvoting and downvoting are some of the many privileges that are unlocked that require 15 and 125 reputation respectively. Downvoting will lower users reputation, so you need to be more established in the site before unlocking this privilege.