Legacy vs. new form numbers: New aligns labels top

Using latest version of plugin: 3.0.1.1
When I use legacy form number, labels align to left of field.
[salesforce form=”4″]
When I use new form number, labels align on top of field.
[salesforce_form id=”15180″]

Both are on this page: https://voicesforciviljustice.org/for-advocates-2/sign-up-new/
Legacy is above. New is below. Both shortcodes refer to the exact same form, on which which label location=left aligned.

Custom CSS is the default newly copied from the Styling tab today. I can’t think what else to change. Thank you.