When designing my newsletter, I click to preview my design on mobile and the design looks correct. When I send a test email and look at my phone (iPhone 11) the design changes and it looks nothing like how it did when I clicked to preview.
Thank you for reaching out to the Community! I do apologize that you are having this experience. Can you please send a screenshot of what you see, the campaign name in the account, your username, and a reference to this post to social_support(at)constantcontact(dot) so we can do additional research on this? Thanks!