Green chart tiles mean your charts are updated. Orange means update missing and yellow as I remember chart permits has expired. Pls refer to your manual cos I haven’t worked on FURUNO FMD after 2018. If you the catalog shows yellow for the enc whose permit is still valid that means you have the same enc expired before but not been removed from the system. It’s like it has been overridden. I’m that case carefully check and remove the older permit and the chart will appear green.