random tagline showing in every sent (from me) email preview

random tagline showing in every sent (from me) email preview

In the email preview on Gmail and Zoho there is an old tagline. It was never included in Signature. I think it was used in a previous LeadPages or ConvertKit email sequence. Has anyone heard of this happening before? How do I remove it? When I open the email it is not in the actual email. Its only the preview.