Hi Kelly,
I wasn’t using a hidden field in MC or messing with the form ID. But if you’re having the trouble I was having, whenever I tested my form (no matter what groups I selected on the live form) it put me in ALL the groups.
My solution was to use Mailchimp to generate an embedded form (like this). I used the “naked” form so there was no CSS or JS included. I then put that in my page using an HTML embed in Webflow and styled it with my Webflow styles (exported the code of my page and grabbed the classes for each element and added them to the mailchimp code so it looked like what I formatted in Webflow).
Hope that helps!