Field Types Do Not Match with Mailchimp (how to fix)

Why does Mailchimp require matching field types?

Mailchimp requires matching field types so that data within that field stays consistent across records

What does a red warning vs. a yellow warning mean?

A red warning indicates that an entire record will fail to send to Mailchimp
A yellow warning indicates that a field within a record will (or may) fail to send to Mailchimp
For Mailchimp Dropdown and Radio Button there will always be a warning. The options within the Mailchimp field and the POWR element must match exactly, including capitalization.