eOne Smartconnect - Integration map fields cannot change from "List Option"

Problem:
When using eOne Smartconnect, and trying to create a map, one of the source fields is set to "List Option" by default and does not change even when you manually change it using the drop down menu.

Solution:
Drag the field you want to integrate from the "Source columns" on the left side of the window onto the field in the "Destination Column". This will change the field to "source column"