Do you mean when an admin user logs in you see the interface, but when a non admin logs into NFA they do not see the interface?
If so, log in to the NFA Admin->Physical and Virtual page and see if there are interfaces named like "OLD" or if there are two or more interfaces with the same ifindex. If so delete the OLD interfaces or delete the duplicate interfaces that are have an older last flow timestamp.
See the solution in the kb article below for a similar but related issue.
NFA data not seen in CAPC, but is seen in NFA - CA Knowledge
Also see this kb as well if that doesn't resolve it NFA data not seen in CAPC, but is seen in NFA - CA Knowledge