The magnifying glass badge tells you the field can be quick searched. Green indicates a field that can be searched more quickly than one that is yellow. It does not have anything to do with whether or not a field will "auto-populate" with data or not. The yellow magnifying glass often indicates that the field is from a related table occurrence, so the fact that expected data is not appearing in such a field could point to issues with the relationship or the design of your layout.
Thanks for your explanation. It looks like I fixed it!