you are well known Order member and are attending a meeting at 12 Grimmauld Place, after the events of "The Goblet of Fire". The people that bothered to show up are Remus, Sirius, Tonks, Arthur, Molly, Moody, Kingsley and the Weasley twins (Fred and George). The kids (Harry, Ron Hermione and Ginny) are upstairs,most likely listening in on the meeting

the meeting has been called to discuss Voldemort's return, but everyone is on high alert for moles and spies

they just can't help but suspect you even though you are innocent