Invalid 76561198019635474 Toasty~ ! (SR Scammer)

steamID: Toasty~ !
steamID32: STEAM_0:0:29684873
steamID64: http://steamcommunity.com/profiles/76561198019635474
customURL: http://steamcommunity.com/id/Hoshii-Miki
steamrepURL: http://www.steamrep.com/index.php?id=76561198019635474

So my friend just showed me this site awhile ago and said I was labelled as a scammer and apparently I am and have no clue why. I've done a few trades on SPUF and tf2 which have all gone perfectly I've never ripped anyone off in my life which is why I'm really curious why I'm labelled a scammer. Can anyone give me an explanation towards what I did and how I can remove this title please? Thanks.