Merge Fields Not Updating

I am having issues with the fields on this form mapping incorrectly to MailChimp. Halfway down this page, you’ll see a button that says “Send me the Chapter”.

A popup appears asking for Email, First, Last, Company, and Job Title. Email, First, and Last are mapping to the correct fields in MailChimp. Company and Job Title should be mapping to MMerge 11 and MMerge 10 respectively. I have completely deleted these two fields, added them back into the form and when I check, they are mapping correctly. I hit all the update/save buttons and then go back to the dashboard. When I go back into edit the form, those merge fields have reverted to MMerge3 and MMerge4 and this puts the information that people are submitting into the wrong fields in MailChimp.

Is anyone else having this issue? Am I missing a step in my editing?

Thanks for any help provided!

The page I need help with: [log in to see the link]