I've been noticing that all default email templates break on outlook. The padding is missing and the widths get messed up.
I thought it was just my outlook until I did an email test using a service. Now I see that it's only the desktop outlook and not any of the online email services.
I can provide a screenshot to show what I mean, but it should be easy to replicate for anyone with outlook on their computer. I've tested both the receipt and category specific emails.