Currently, the quality/rarity is not always displayed correctly, when looking at an item needed for a crew.
Items, like crew, have various levels of quality/rarity. They share the same icon but have a different border, and description.
Please look closely at the description of what is required to equip on your character. You probably have the same type of item but not the correct quality/rarity.
One of our player has created a nice guide explaining this, it can be found here: https://www.disruptorbeam.com/forums/stt/viewthread/47737/