Check the Condition tab of the Media pool that thsi media lives in. You will see 'Valid for' next to a field, the default value is 36 months. If your media was formatted outside of the 'Valid For' period, it will show up as Poor. IN the same media pool, you may see other Poor media, but, also, some Fair (Yellow) media
Either export and reformat this media which starts the clock again, or increase the Valid For period, I usually recommend 84 or 96 months