My inbox "SUBJECT" and "FROM" are not correlating. Thunderbird is attaching the incorrect email to the subject.

HELP! My inbox "SUBJECT" and "FROM" are not matching. Thunderbird keeps jumbling my emails in my inbox so that the sender's email does NOT correlate to the correct email they sent... The order of the different columns in the inbox do not lineup - Thunderbird changes the sender name, or the subject. Hope that makes sense. For example I click on an email from my boss regarding a shift and an email from Voile skis comes up about some new products. The subject is the same one that is in the email but the "FROM" is my boss' email! Please help, I have quit re-opened, opened in "troubleshoot" mode, made sure I am in the newest update, etc. Thanks