I'm having an issue with one email I send from one particular sender profile (in Email Studio in the Salesforce Marketing Cloud). The pre-header seems to be caching and displaying a pre-header from an email with the same sender profile from over a year ago.

The pre-header that displays is not in the code anywhere. And it only seems to be a problem with this one email. Also, I can't see the cached pre-header but others have told me they see it.

Have you heard of this happening/ is there a fix?

Thank you!