History Subpanel displaying all contacts/emails in opportunities

In opportunities, the history subpanel is displaying emails and contacts related to other opportunities. I went through all the php code and everything seems to be correct, as the other subpanels are displaying the correct information. Single opportunities are still associated with a single email. Our subpanel is not customized and we are using default relationships. Any suggestions are most appreciated. Thanks!

From the admin repair menu run repair relationships and run a Quick repair and rebuild

Thanks Mac-Rae. I tried that a few times but it didn’t work sadly.