A few questions:
- Are you rooted?
- Are you running Stock ROM?
- What SMS application are you using?
- You said it has happened for some time? When did you notice it? After an upgrade? After you switch texting applications?
- Do you have contacts that share the same phone number?
I dont know what rooted is and stock rom I would assume so...no SMS applications...Im running 2.2...shouldnt be contacts with the same phone number