I looked on the FAQ and I couldn't work out what it is Everytime I try to buy something on the market, it says "Your account is in trading greylist." and I can't buy anything. Does this mean I was banned? Because I didn't receive any infractions.
Plz help.

I may not be able to answer correctly, but I believe tradings greylist simply means that
you won't be able to buy, sell, or transfer items for a short time.
Not a ban. If the problem persists, then just email support.

Ok... I don't understand why it happened to me though :/

Email [email protected] and ask them to remove you from the greylist.