Why is the horizontal line acting different depending one where in the email it exists?
In email builder 2.0
That the line is acting differently does not go together with my customers graphic profile.
During your testing/reviewing the email using Advanced Testing, have you noticed the line runoff issue is specific to Gmail or does it render this way throughout different email providers?
Unfortunately, I see the problem on all email platforms
If you are seeing this problem throughout different email providers I would suggest filing a support ticket (including screenshots) of the issue you are experiencing.
It could be padding or margin applied to the line or the container the line is in if that makes sense :)
Check the styling tab.