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Hello Laura, thanks for reaching out to us! The is Abe from the Moz Help team and I'm hoping I can lead you to the right place. Since I will need to look at your campaign and most likely your html, let's create a ticket for this so we can dig in and find the cause. Please email this issue to help@Moz.com and ask for Abe in the subject line. Include your campaign name and the site in question.  I'll pick up from there and get this figured out. I look forward to hearing from you!