Bullet Indentation Looks Different Post Delivery

The behavior of the bulleted lists in Constant Contact both in edit and preview mode don't hold post delivery.  Before I send it, it looks like a normal list, one tab space, perfectly fine. I look at it in Preview, also fine. I send a test message or a live test (live email vs. test email) to a subset of users, and the bulleted list appears indented twice. I can't out tab/indent, because it's built correctly. It's just not delivering correctly. So, like the car rental place in 'Seinfeld,' it knows how to take a reservation, but not keep a reservation.

Is anyone else experiencing this? Is it some weird Outlook thing or some weird Constant Contact thing?