Gray listed items are specifically mentioned in this document:
About iCloud Music Library icons and status - Apple Support
If your songs appear in light gray text
Your songs might appear in iTunes in light gray text for a variety of reasons. Those reasons include:
- You're not connected to iCloud Music Library. If you see a Disconnected icon in the upper-right corner of iTunes, you're not connected to iCloud Music Library. Click the icon to reconnect.
- The song isn't in Apple Music or isn't available in your current country or region. These songs also appear in gray if you search for them in Apple Music.
- Restrictions are turned on for explicit tracks. Learn more about Restrictions.
- An artist or content provider made changes or edits to an album. You might need to remove the album from your library and add it back from the Apple Music catalog.
I hope this provides some insight. The last bullet seems plausible in your situation.