I apologize for the way your email is appearing when you're using Thunderbird. Is this happening in any other email client? Do these changes happen when you send yourself a test preview or during a live send? Also was any of the text you're see being effected copied and pasted into your email?
Feel free to respond to this post with your answers. If you wanted to continue this conversation privately you can also email us your answers at social_support(at)constantcontact(dot)com with your username, the name of the email you are working on, and a reference to this post.
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