Hi there, 

We had accidentally added the wrong contact to an opportunity, as the contact has the same name as someone in another organisaion or "account" - however, since replacing them with the new contact, it now comes up with both contacts associated with the opportunity. I've attached an image of what this looks like to give you a clearer picture. 

Is there a way to dissociate the incorrect contact person from the opportunity? 

Thank you,

Vanessa