General Discussionwhy there is difference between dota profile frm steam and mine here ?!?

i won 43 games lost 42 why i got 44 lose 43 win here ??
this winratio is wrong and who is testiclescousin i dont even knw him and in my profile on dotabuff i have played 3 games with him and he is my friend ? O.o no he is not ... i have never seen his name either