Online Express donation forms generate an email confirmation to the donor of their gift. However if the Billing Address merge field is used and the email is opened in some email clients, the address fields display correctly but appear pushed together. (Note: The Billing Address merge field is not available if the form is set up to generate receipts on the 1. Get Started tab as the donor address appears in the generated eReceipt.)
We are currently evaluating this issue and will update this article when we have more information.